Refers, in literal terms, to a curved line -- as in Martin Luther King, Jr.'s famed "arc of justice." Could also be used as a reference to Joan of Arc -- Arc being, there, derived from her father's name, rather than a place -- or, conceivably, to Noah's Ark.

The name August is at its highest point since the 1890s, when it ranked among the Top 100 boy names in the US. And deservedly so, given its great meaning, historic roots, and cool nicknames.
THE celebrity baby name of the moment, August was chosen by both Princess Eugenie and Mandy Moore for their baby boys in early 2021. Before that, August had been heating up in Hollywood – used by Mariska Hargitay and Peter Hermann, Lena Olin, Dave Matthews and Jeanne Tripplehorn for their sons
August is the only truly popular month name for boys. The month of August was named after the Emperor Augustus.
 August has two august literary namesakes: the Swedish playwright August Strindberg (it has always been a popular name in Scandinavia), and August Wilson, as well as photographer August Sander.
 The French version is Auguste (ow-GOOST), as in Edgar Allan Poe's clever detective Auguste Dupin and famed sculptor Auguste Rodin.

August

Augustine 

Edgy German capital with definite possibilities as a baby name. 

Berlin

A popular name in Denmark, in this country Bo has some cowboy swagger and a lot of substance in its minimal two letters.
In Mandarin Chinese, Bo means "wave".

Bronte

Heavenly French word name used for both sexes.

Ciel

Crimson is a rare unisex color name used more frequently among baby girls.
 
The word "crimson" was derived from the name of the Kermes insect which produces the dye associated with the color. The insect name evolved from the Arabic word qermez, meaning "red."

Crimson

An early and still one of the most <a href="https://nameberry.com/unisex-names">popular unisex names</a>, also a place name and name of a Native American people in the northern Mississippi valley, which makes it a controversial baby name choice. While the popularity of Dakota is trending downward for both genders, it's one of those rare genuinely gender-neutral names that is used for nearly equal numbers of boys and girls.

Dakota

Douglas 

This Biblical name was rising dramatically for boys, but has plateaued in recent years. Although it's more popular for girls, it's a delightful unisex choice. Eden is one of the <a href="https://nameberry.com/popular-names/france">Top 100 Boy Names in France</a>.

Eden

Less popular than Emery, this name also attributes to Emory University. Both spellings of the name lean more heavily to the girls' side, but this one is not quite as unbalanced.

Emory is used about 40 percent of the time for baby boys, while with Emery, it's only a bit over 10 percent.

Emory

Ephraim is an Old Testament name we would place high on the list of neglected Biblical possibilities, solid but not solemn.
 In Genesis, Ephraim is the second son of Joseph, and founder of one of the twelve tribes of Israel. The name also appears as characters in Oliver Goldsmith's The Vicar of Wakefield, Charles Dickens's novel Little Dorrit, and in works by Sir Walter Scott and Robert Louis Stevenson. More recently, Ephraim Black was a character in the Twilight saga, a shape-shifter who was the great-grandfather of Jacob.
 Father and son violinist and actor Efrem Zimbalist, Jr. and Sr, simplified the spelling.

Ephraim

Because the legendary Faust sold his soul to the devil, few parents would choose this for a child, although Fausto is commonly heard in Italy and Spain. 

Faust

Fox is one animal name backed by a longish tradition, and then popularized via the lead character Fox Mulder on X Files. Fox is simple, sleek, and a little bit wild, and could make an interesting middle name.
 It was reported that the TV character's first name was not a tribute to the Fox network which aired The X-Files, as often assumed; show creator Chris Carter said he had a childhood friend named Fox. Fox was one of the fastest-rising boys' names of 2016, perhaps because of the popularity of the X-Files revival.

Gale for boys is more a storm name than a short form of Abigail. Since Gale has resurfaced as the name of Liam Hemsworth's daring character in The Hunger Games, it has new force for boys.

Gale

After Leo, this is one of the most usable names in the zodiac: part ancient, part new-age, part high-tech. In the night sky, the constellation Gemini is present all year round in both hemispheres. It has been associated with twins since ancient times, and its two brightest stars are named Castor and Pollux after the twins of Greek mythology. It also has STEM connections: Project Gemini was a NASA spaceflight program before Apollo.

Gemini

Greer is typically used as a girl name in the US, particularly in this form. The spelling Grier is gender-neutral, given to boys about 43 percent of the time.

Greer

Hemingway readers will recognize this as the name of Papa's first wife (and, eventually, actress Mariel's grandmother). But in Victorian times, Hadley and Hedley were actually more popular for boys.

Hadley

Could Hal be the Jack, Max, or Gus of the future? It just might happen in the new nickname environment. Hank Azaria put it on his son's birth certificate.
 Hal is a venerable nickname for Henry, Harry and Harold, famously used by Shakespeare in King Henry IV as the name of the king's son, the future Henry V.
 A number of show biz figures of a certain era have gone by the name, including Hals Roach, Wallis, Ashby, Holbrook, David and Linden. In the eponymous film, Jack Black played "Shallow Hal."
 As for the bad-guy machine in "2001: A Space Odyssey," that HAL stood for Heuristically programmed ALgorithmic computer.

Harper got its start as a celebrity baby name when Paul Simon chose it for his now-grown son. Since then, other famous parents have followed suit: musician Tim Finn and actor Cecilia Peck both have sons called Harper.

Other high-profile Harpers, like author (Nelle) Harper Lee and starbabies Harper Burtka-Harris and Harper Beckham, are female, but it makes a handsome choice for either sex (and is in the US Top 1000 for both boys and girls).

Harper

Holland, like most place names, is gender neutral. There's about one boy Holland born in the US these days for every girl Holland. 
Holland ranked among the Top 1000 boy names in the US around the turn of the 20th century, and a hundred years later, entered the Top 1000 for girls.

Holland

Halsey 

Hannelore

Hathaway

Indigo is one of the most appealing and evocative of the new generation of color names. Color names have joined flower and jewel names -- in a big way -- and Indigo, a deep blue-purple dye from plants native to India, is particularly striking for both girls and boys. Although most people don't think of it like this, Indigo might also be considered among the most stylish <a href="https://nameberry.com/baby-names/167/greek-names">Greek baby names</a> in use today.

Some cultural references: The Indigo Girls are a folk duo, 'Mood Indigo' is a classic Duke Ellington jazz composition, and there is a 1970's New Age theory that Indigo children possess special, sometimes supernatural abilities. Indigo is the name of a character in the Ntozake Shange novel Sassafrass, Cypress & Indigo, and was used for his daughter by Lou Diamond Phillips.

Indigo

Ira is one of the shortest, non-biblical sounding Old Testament names, belonging to one of King David's thirty 'mighty warriors.' It was widely used in the US from the 1880s to the early 1930s (it was Number 57 on the Social Security list in 1881), but fell off completely in 1993. Although Ira is also a retirement-account acronym, it's back on the table for those seeking a short biblical name for their sons, and reentered the US Top 1000 in 2016. A musical namesake is lyricist Ira Gershwin (born Israel), a literary one is Ira Levin, and there are two prominent Iras hosting NPR radio shows.

Extremely attractive color name chosen by some African-American families for its reference to the West African Ivory Coast; more commonly used for girls. 

Ivory

Though this feels like a modern invention, Jay has been in use for centuries. Early Jays often were named in honor of founding father John Jay, whose surname derived from the jaybird. A popular mid-century choice, Jay was in the Top 100 from 1956 to 1970. In the last couple of decades he was replaced by such more elaborate forms as Jayden, Jaylen, and Jayce. But Jay could make a comeback in tandem with cousins May, Kay, Fay, and Ray.
 In literature, the most prominent Jay wasn't a Jay at all—Gatsby's birth name was James Gatz. In real life, the honor goes to Jay Leno, also born James.
 In India, Jay is used as a modern variant of the Hindi Jaya, which means "victory."

Though Jules hasn't been on the US popularity list in fifty years, it is a current hit in its native France—where it's currently in the Top 10—and we can definitely see it making a comeback here, being far more romantic than, say, Jim. 
 The glittering Jules has a solid history, attached to such cultural notables as author Verne, opera composer Massenet, painter Olitski, and cartoonist Feiffer, as well as appearing as a character in such iconic films as Pulp Fiction and St. Elmo's Fire and in Balzac's novel The Human Comedy and Ayn Rand's Atlas Shrugged.
 These days, Jules is also apt to be heard as a nickname for the feminine Julia or Julie, as in TV personality Jules Asner, the Keira Knightley character in Bend it Like Beckham, and celebrity chef Jamie Oliver's wife—spelled Jools.

Jules

Juno

With the likes of Wren and Lark highly fashionable right now, Kestrel could make for a fun — and fierce — alternative for either gender.

Kestrel

The Kodi respelling of early 90s favorite gender neutral name Cody might have gone unnoticed were it not for Australian actor Kodi Smit-McPhee, star of Jane Campion's Power of the Dog.

Kodi

Levi, lighter and more energetic than most biblical names, with its up vowel ending, combines Old Testament gravitas with the casual flair associated with Levi Strauss jeans. 
 Now it's being rediscovered in a major way—Levi has been shooting up the charts in recent years. Extremely popular in the US, it's also a Top 100 name throughout the English-speaking world as well as in a diverse range of countries from Germany to Brazil.
 
In the Old Testament, Levi was the third son of Leah and Jacob, from whom the priestly tribe of Levites descended; in the New Testament, Levi was Matthew's given name before he became an apostle. It is suspected that Levi derives from the Hebrew word yillaweh, meaning "he will join." 
 Levi received a lot of attention as the sons of Matthew McConaughey, Sheryl Crow and Sara Gilbert.
 In the Thomas Hardy novel Far from the Madding Crowd, Levi Everdene is the father of the heroine. 
 <br/
Levon is a related name.

Levi

A musical name that's more popular for girls, but has been hovering just inside the Top 1000 for boys since 2007.

Lyric

Laine 

Along with August, March is one of the month names perfectly suited to boys. This brisk single-syllable name – which derives from the name of Mars, the Roman god of war – is worth considering as either a first or middle option. As a surname, it brings warm memories of the girls of Little Women, and of twentieth century actor Fredric.

March

The name of the Roman god of war began to sound less intimidating when Erykah Badu gave it to her daughter, and musicians Thomas and Bruno Mars (the latter born Peter Hernandez) have given it a modern edge. Mars actually could make a pleasant, planetary middle name for either sex.
In Roman mythology, Mars was the god of not just war, but also agriculture, and was more down-to-earth and less cold and ruthless than his Greek counterpart Ares. He was considered a father of Rome, as he was the father of mythical founder Romulus.

Mars

Marshall is an occupational surname, not having to do with anything military or martial, but stemming from the Norman French for someone caring for horses. It's been used as a first name since the nineteenth century and has been on the Social Security list since it started to publish its data in 1880.
 Marshall is the real name of rapper Eminem, and it got some attention during the heyday of communications maven Marshall McLuhan. Peyton Manning named his son Marshall, and Jason Segel played the character of Marshall Eriksen on How I Met Your Mother.

Marshall

Mavis

Mich

Nox was the Roman goddess of the night, equivalent to the Greek Nyx, from which her name was derived. Although identical in sound, Nox is unrelated to the Scottish masculine name Knox.

In Greek mythology, Nyx was a powerful goddess and the embodiment of the night, but when spoken, its negative meaning can't be ignored. 

Oakley 

Oktober

Pele is a female name in Hawaiian culture that could make a provocative choice for a modern girls. Others might think you named your daughter after the all-time great soccer player, but the simple, rare, and lovely name Pele has mythological roots.

Pele

Peyton is a unisex surname that's not only survived but continues to grow in popularity because of its rich southern-accented softness combined with the pre-Desperate Housewives naughtiness of Peyton Place. In recent years, more boys have been named Peyton thanks to football star Peyton Manning, but the projected film of William Styron's Lie Down in Darkness which features heroine Peyton Loftis may further popularize Peyton as a girls' name.

Peyton

Hip new middle-name choice, conjuring up the gothic tales of Edgar Allan, and current single-named pop singer Poe. 

Cool new Q-starting possibility which suggests a sense of curiosity and purpose. 

Quest

Novel choice for the child of authors. Quill could be used to honor someone with a rhyming name, such as Jill, Bill, Phil, or Gil. 

Quill

Quinn is one of the first popular Irish unisex surnames, a strong and attractive choice on the rise for girls but still popular for boys. Quinn was used for about 3000 baby girls and 700 boys in the US last year.
 
Quinn is the Anglicized version of the Irish patronymic surname Ó Cuinn, meaning "descendent of Conn." Conn has two possible derivations—the Old Irish cond, meaning "intellect," or cenn, meaning "chief." One of the most notable Quinn clans was from County Tyrone in Northern Ireland. 
 Quinn started taking off for girls in the mid-nineties, possibly influenced by the popular show Dr. Quinn, Medicine Woman. Since then, there have been female Quinns on the animated MTV show Daria, on Zoey 101, and—most prominently—on Glee, featuring cute blond cheerleader character Quinn Fabray.
 Some other, more <a href="https://nameberry.com/lists/category/unusual-names">unusual names</a> with the Q-factor: Quincy, Quintina, Quintana, Quinta, Quilla--and, on a different note, Queenie.

Quinn

In Japan the lotus is the Buddhist symbol of purity and perfection. In the US, Ren can also be short for Lauren or Renee, but it could be misspelt as the more popular Wren.

Rishi

Ro is a casual short form that doesn't usually appear on the birth certificate on its own. But it makes a friendly nickname for any girls' name starting with Ro-.

Runes are symbols in ancient Germanic alphabets. They are often viewed as mysterious and therefore as a name, Rune imparts a feeling of folkloric mystery.

As intriguing as that might be, the homonym ruin creates a lot of teasing potential.

Rune

Supermodel Christie Brinkley launched an entire name genre when she picked this breezy occupational name for her daughter in 1998, and it has become more prevalent in recent decades. The Saylor version, which you might consider a spelling spin or a surname-name, is now among the Top 500 names for girls, given to three times as many baby girls as the Sailor spelling. Counted together, Saylor and Sailor were used for about 1000 baby girls in one recent year in the US, versus about 100 boys.

Sailor

Scout, a character nickname from To Kill a Mockingbird (her real name was Jean Louise), became a real-life possibility when Bruce Willis and Demi Moore used it for their now grown middle daughter, followed by Tom Berenger a few years later. A unisex choice that is growing in popularity for both genders -- but given to girls about four times more often than to boys -- it was picked by skater Tai Babilonia for her son and Kerri Walsh for her daughter Scout Margery.
 It makes a virtuous, upstanding choice for a girl--a good scout. And though it hasn't made it onto any popularity lists, it's gone from slightly eccentric to mainstream.

Scout

Simple, Zen-like name of a mythological forest elf. 

Cool meets Born Again meets Brad and Angelina, who made Shiloh an instant star when they chose it for their daughter. While Shiloh has risen from obscurity thanks to its celebrity baby use, it hasn't become a star the way brother names Maddox and Pax have. It entered the Top 1000 in 2007, one year after the birth of Ms. Jolie-Pitt.
 The town of Shiloh is mentioned several times in the Old Testament--it was where Joshua and the Israelites assembled to cast lots for the seven tribes and for many years it was where the Ark of the Covenant resided, becoming a place of pilgrimage. Shiloh is also the site in Tennessee of a major, bloody, Civil War battle.
 Trivia tidbit: Shiloh is the name Angelina Jolie's parents had picked for their first child before her mother miscarried.

Shiloh

A short and sweet Spanish and Portuguese name, meaning "sun". Sol has been used on its own for centuries (it belongs to one of the daughters in the 10th-11th century Spanish epic poem "El Cantar de mio Cid"), and it is also found as a short form of the Marian names María del Sol and María de la Soledad, and of the related names Marisol and Soledad. A famous bearer is Argentine TV presenter (María) Sol Perez.
 
Sol is also one of the <a href="https://nameberry.com/list/433/goddess-baby-names">goddess names</a> fashionable for baby girls: she's a Nordic sun goddess, also called Sunna.
 
Sol entered the Top 1000 for the first time in 2022, surpassing the previous favorite sunny form, Soleil. Along with Soleil, other intriguing longer forms include Marisol, Solange, and Solvieg.

Sydney was a hot girls' name in the 1990s, but she's arguably still cool. One of the original old man names adopted for baby girls, Sydney's popularity may be down but she's not out. 
 Cool girl actress Sydney Sweeney, of Euphoria and White Lotus, is doing a lot to burnish Sydney's image. The city of Sydney, Australia is another familiar reference.
 Katharine Hepburn played a female Sidney in her first movie, A Bill of Divorcement and lately there have been women named Sydney all over the big and small screens, including Annette Bening in The American President, and on Alias, Parenthood and Hope and Faith.
Actor Sidney Poitier named his daughter Sydney back in 1973,

Sydney

Soren

As Meghan/Megan and Reagan/Regan show signs of wilting, along comes Teagan to take up the slack: definitely one to consider. The vast majority of American babies named Teagan are now girls. A variant spelling is Teaghan.
 St. Tegan was a Welsh saint, whose name came into general use in the late twentieth century, partly inspired by a character in Doctor Who Tegan may have different roots and a different meaning from the Irish Teagan, but it also can be used for both genders.

Teagan

Thyme

A rich brown hue, but can be misheard as Amber, said with a pretentious accent. 

Umber

Urien

Variation of Valentina with the same pared-down appeal as Maren.

Valen

Valentine 

Wren, a lilting songbird name, could be the next Robin. Wren entered the Top 1000 for the first time in 2012 and is among the new wave of popular <a href="https://nameberry.com/baby-names/501/english-names-for-girls">English names for girls</a>.
 Wren makes a particularly pleasing middle name choice, as does her newly discovered cousin Lark. But it's more popular as a middle name than you might think, the quirkier cousin of Rose.
 This petite bird was regarded in Ireland as the "magician of the birds" and the Druids considered it a bird of prophecy. Thanks to an early fable, it has also been known as King of the Birds.
 For architects there's the link to the great Sir Christopher Wren, the celebrated eighteenth century designer of London's St. Paul's Cathedral.

Wren

Unisex Chinese name ideal for a child born in the winter.

High-Scrabble-scoring name used by rap couple Lil Scrappy and Adi "Bambi" Benson in 2020. If it has anything to do with xylophones, it comes from a Greek root meaning "wood".

Xylo

Yarrow is a flowering herb that grows wild in Europe and North America, and has long been used in several Native American and European cultures as a healing plant. Named for the mythical god Achille, Yarrow is a symbol of enduring love.

As a baby name, Yarrow is highly unusual, given to no babies in the US in the most recent year counted.

Yarrow

Most familiar to American ears as the Russian variation of George. Not recommended for a daughter.

Yuri

Yuki 

Rarely given to baby girls, but we like the idea of it.

Zeke

Parents searching for a simple, peaceful name may be attracted to this one.

Zephyrus was the Greek god of the west wind, and all names associated with him have a pleasantly gentle, breezy feel. 

Zephyr

Arcane 's list "Unique Truly Unisex and Nonbinary names" of 80 great name ideas: Arc - Zephyr!

Unique Truly Unisex and Nonbinary names

Will include both 'masculine' and 'feminine' sounding names but I'll try for it to be mostly as neutral as possible. /// I'll tag them the first half as 'boy names' and the second half as 'girl names' because Nameberry doesn't have a Unisex option ;-;
(My knowledge of how gendered certain names are in different cultures isn't all that refined but these are just names that sound neutral to me)