Abbreviated form of Harley that might also be spelled, for girls, Arleigh or Arlee.

Arley

Quirky cool Arlo is now well and truly back. Last year it broke into the US Top 200 boy names and consistently ranks among the most popular boy names on Nameberry. 
 Arlo is even more popular in the UK, Australia and New Zealand. Arlo is also one of the top baby names among Nameberry's visitors from leading US cities.

 
Once strongly associated with shaggy singer Arlo Guthrie, Arlo has an animated and cheery feel, thanks to its upbeat o ending. It was chosen by Toni Colette for her son in 2011, which brought the name back into the spotlight. Previously, Arlo was in regular use in the first half of the twentieth century—it was Number 667 in 1915, for example, but it had dropped off the charts in 1944.
 Arlo has many possible derivations along with its Irish and English roots. It may be a shortened form of the Italian name Carlo or the Spanish Carlos, and in Basque-speaking regions it is the word for area. In English, Arlo was used as a place name, Arlo Hill, by Edmund Spenser in his epic poem The Faerie Queene and is thought to derive from the Celtic word Aherlow, meaning "between two highlands."

 A growing number of girls are also named Arlo in the US each year, with a handful more babies of both sexes receiving the Arlow and Arlowe spellings, which take this name more into smart surname territory.

Arlo

A pretty, dainty name for one of the little characters in the children's book series The Borrowers. It was the basis for a later Studio Ghible animated film, The Secret World of Arrietty. While the connection to Harriet is tenuous, you might want to consider Arrietty as an honorific for an ancestral Harriet, Harry, or even Henry or Henrietta.

Arrietty

Aspen is part of two groups of stylish and unique baby names: <a href="https://nameberry.com/list/329/nature-baby-names">nature names</a> and place-names. The name of a graceful tree in the poplar family with heart-shaped leaves so delicate they quiver in the gentlest breeze, Aspen is also the name of a trendy Colorado ski resort. Aspen started as a unisex name possibility but now is much more frequently worn by girls.
 Aspen entered the popularity list in 1993 and is a good bet to start climbing higher as more and more parents respond to the appealing place and nature image it evokes.

Aspen

Birdie was until recently a middle-aged Ladies' Club member wearing a bird-decorated hat --but now it's just the kind of vintage nickname (think Hattie, Josie, Mamie, Millie) that's coming back into style in a big way. Actress Busy Philipps named her baby Birdie (inspired by First Lady Lady Bird Johnson), as did soap star Maura West.
 In an earlier heyday of nickname names--the 1880's--Birdie was a Top 200 name.

Birdie

If Erykah Badu can name her son Seven, why can't you name your daughter (or son) this? Eleven has recently gotten a lot of attention via the character on the TV show Stranger Things. 

Eleven

The girls have Violet and Scarlet and Ruby and Rose, but for the boys there's a much more limited palette of color names. Gray (or Grey), is one exception, which could make for a soft and evocative--if slightly somber-- choice, especially in the middle. Kaitlin Olson and Rob McElhenney recently named their son Leo Grey.
 A common surname, Gray/Grey is still an unusual first name choice--it hasn't made it into the Top 1000 in this century--while longer forms Grayson and Greyson are climbing rapidly, with Grayson at Number 97, and his twin at 200.
 The best known bearer of the name, former Governor Gray Davis of California, was born Joseph Graham Davis, Jr, and others with Gray names include Graydon Carter (born Edward Graydon), editor of "Vanity Fair," and Grayer, the child in "The Nanny Diaries."

Gray

Isla is a hit name throughout the English-speaking world but hasn't found the same popularity in other western countries, perhaps because its spelling and pronunciation don't make sense for those whose native language is not English. Think island without the final two letters.

Adding to the confusion, the name is a twin of the Spanish word for island, which is pronounced EES-la. Isla is part of a trend for simple, old-fashioned <a href="https://nameberry.com/girls-names">girls’ names</a> that start and end with a vowel: Ava, Ada, Ella, Emma, Eva, Ida, Ivy. 
 
Red-haired actress Isla Fisher, married to Sacha Baron Cohen, propelled the name to stardom. Isla Black Hitchens is a Harry Potter character; Queen Elizabeth has a great-granddaughter named Isla Elizabeth Phillips. 
Some other similar names that are not as trendy as Isla: Islay and Ailsa.

Isla

Lila is one of the <a href="https://nameberry.com/girls-names">girl names</a> with a double l sound — Lila, Lola, Layla, Leila, Lily et al — that have caught on in a major way., Delicate yet dynamic, Lila has a slightly international flair.
 
The one caveat, and you may consider it a big: As a group, the La-La names have gotten so stylish so quickly that they're verging on full-blown trendiness and tend to blend into one another. So while there may not be another little girl named Lila in town, between those named Lillian, Lily, Layla, and so on, you may feel there's a double L overload.
 
Lila was derived from the Arabic word laylah, meaning "night." It has separate roots in Sanskrit with the meaning "play." In Hinduism, Lila is a conceptualism of the universe as a playground of the gods. Lilah and Lyla are variant spellings. 
Lila has been a recent hot TV character name, seen on such shows asDamages and Dexter, as well as Friday Night Lights, where the name is spelled Lyla—another trendy version.
 Trivia tidbit: Diane Sawyer was born Lila Diane.

Lila

Lilou is a charming, rarely heard import. Occitan is a language spoken in Provence, in the south of France, in which the suffix "ou" denotes a pet form &mdash; thus, Lilou as a short form of Liliane or its Occitan form Liliana or Liliano. Its popularity in France--where it's currently Number 12--can be traced to the 1997 film The Fifth Element. 
 Pronounced lee-loo, this is an enchanting option.

Lilou

Mavis, another word for the song thrush, is also a relative of the Welsh word for strawberries, mefus. Mavis has something of a British World War II feel, a friend of Beryl and Doris, but it was quite popular in the U.S. a couple of decades earlier, peaking in the Roaring Twenties. With the renewed interest in names ending in 's' — and in bird names — Mavis could make a return, especially with the new interest in Maeve, and in fact, it reentered the US Top 1000 after a 50-year absence in 2016.
 
Some noted bearers of the name are R&B singer Mavis Staples, a member of the Staple Singers, Canadian writer Mavis Gallant and the feminist activist Mavis Leno.
 
Mavis Gary was the name of the Charlize Theron character in the film Young Adult. And — trivia tidbit — in her short-running eponymous sitcom, Whoopi Goldberg's character was named Mavis.

Mavis

This unusual unisex surname name is pretty evenly divided between the sexes these days than it was in the late 1800s and early 1900s, when it was almost entirely male.
 
Merritt was a female character in the 1980s flick Where the Boys Are, and Merritt Wever plays the endearingly awkward young Nurse Zoey on Nurse Jackie, for which she won an Emmy.

Merrit

Milo is most commonly considered to be Germanic name derived from the Latin word miles, meaning "soldier." However, there is evidence to suggest it also may have independently spawned from the Slavic root milu, meaning "merciful." Milo predates brother name Miles, a variation that evolved when the name immigrated to the British Isles in the Middle Ages. Mylo is an alternate spelling.
 
Milo has long been a favorite <a href="https://nameberry.com/boys-names">boys' name</a> on Nameberry, also getting some well-deserved appreciation in the wider world. Milo combines the strength of the ancient Greek Olympic wrestler of that name—a six-time winner of the Olympic games—with the debonair charm of a WWII RAF pilot.
 More recently, Milo has been associated with the dashing Milo Ventimiglia of This Is Us fame, and it has also been the name of characters in books Catch-22 and The Phantom Tollbooth, and on screen in Milo and Otis, Alias, and Atlantis: The Lost Empire.
 Ricki Lake, Camryn Manheim, Sherry Stringfield, Liv Tyler, Craig Ferguson, and Alyssa Milano are six celebrity parents who share our enthusiasm for Milo, as do many Nameberry baby namers.
 Milo is often heard in Ireland. Milo O'Shea was a renowned Irish character actor.

Milo

In the contemporary US, Minka attracted notice via actress Minka Kelly, who played the gorgeous Lyla on Friday Night Lights.

This cute and lively nickname name can (and does) certainly stand on its own, but it can also be a diminutive of the diminutive Mina, short for Wilhelmina or any name ending in -mina. 

While Minka has never charted on the US Top 1000 and was given to only a few dozen baby girls last year, Mina is staging a comeback after several decades off the list following World War II, when many German names fell out of fashion.

Minka

Odin is the name of the supreme Norse god of art, culture, wisdom, and law — who was handsome, charming, and eloquent into the bargain. The name projects a good measure of strength and power and has excellent assimilation potential.
 The god Odin was referred to by more than 200 names, including Yggr, Sigfodr, and Alfodr — none of which is recommended. The word Wednesday is derived from Woden, the English form of Odin.
 Odin came to be used as a Norwegian male given name beginning in the nineteenth century, originally in the context of a romantic Viking revival. In the 2001 novel American Gods by Neil Gaiman, the character called Wednesday is an incarnation of the god Odin.

Odin

Pepperoncini

Can one prominent character affect the gender identity of a name? Definitely, as has supernatural bad girl Ridley Duchannes of the Beautiful Creatures series-turned-movie, played by the gorgeous Emmy Rossum. 
 
 Before Duchannes, director Ridley Scott all but owned this unusual surname and so gave it a male spin, but it feels girl-appropriate too, thanks to the afore mentioned character and actor Daisy Ridley. The trendy -ley ending helps it along, as it could easily fit in with Wrenley, Hadley, Presley, and similar.
 
Given to around 100 girls in each recent year, it peaked in 2018 when 124 girls received the name, along with 90 boys.

Ridley

Now that names like Cannon and Gunner, fit for comic book heroes, are rising up, Rogue may fit right in.

Rogue

Roux, a color name meaning russet or reddish brown, is a possible middle name for your little auburn-haired babe, though a post-Hunger Games child would more likely be called Rue. Roux is also a culinary term for a mixture of fat and flour used in French cooking to make sauces.

Roux

Y-ending color adjectives like Tawny and Rusty are nowhere near as stylish as the more sophisticated Lilacs and Violets. 

Tawny

A favorite in England and Wales where nicknames as given names are very much the norm, Tilly has the potential to catch on in the US, given its similarity to the popular Lily and Ellie and the rising stars Millie, Billie, Kallie, and Nellie. 
 
Most often used as a nickname for the strong but lively Matilda, Tilly might also work for recently popular Ottilie. Other less obvious possibilities could be Chantilly, Talitha, Natalie, or Talia.
 
As a stand alone name, Tilly is cutesy but not flimsy, and in recent years, it has been racing up the US charts. Nearly doubling in usage since 2018, a recent count revealed Tilly is given to nearly 250 babies each year. When you combine this with the number of Tillies too, the figure is more like 400. 
 
Notable Tillys include Tilly Ramsay, daughter of Gordan Ramsay, and a chef, present and influencer in her own right; Tilly Keeper, an actress in British soap Eastenders; and Tilly Edinger, a German-American paleontologist who founded paleoneurology.

Tilly

This pet form of such names as Winifred and Edwina and Gwendolyn has loads of vintage charm, a la Millie and Maisie, with a decidedly winning vibe. And it just got celebrity cred as the baby daughter of Jimmy Fallon.
 Winnie had been used regularly on its own in the U.S. through the early 1950's and has a number of varied namesakes. There's the Pooh, of course, and also Winnie Mandela, former wife of South African President Nelson; Winnie Cooper, the charming girlfriend of the young hero on The Wonder Years--whose given name was Gwendolyn; Winifred "Winnie" Foster, a main character in the childhood classic Tuck Everlasting; and it was also a nickname for Winston Churchill.

Winnie

Zuma

kewpiette's list "Fur Babies" of 24 great name ideas: Arley - Zuma!