Allen is the spelling of this name -- other common spellings are Alan and Allan -- most associated with the surname; it might also be the most appropriate if you're trying to steer clear of Al as a nickname, as this can easily offer you Len or Lenny as options.

Allen

Bennett is Ben with a bow tie, kind of a cross between Benjamin and Beckett. It's been trending up on the popularity charts in recent years, and its choice by The Unbreakable Kimmy Schmidt's Jane Krakowski could shoot it even higher. 
 Bennett Cerf was an eminent publisher--one of the founders of Random House--and renowned punster.
 Bennett is a popular surname, and has many noteworthy bearers, from Jane Austen's Pride and Prejudice family (with one 't') to indomitable singer Tony. Bennett has been used as a surname in England since the early thirteenth century.

Bennett

Cason's entire raison d'etre: It's a rhyming variation on the popular Jason, Mason and Brayson. Casen, Kasen and Kason also have crept into the Top 1000 in recent years.

Cason

Cohen is a common last name among Jews and an important spiritual name in the Jewish religion, associated with the hereditary priests who claimed descent from the biblical Aaron. As a result of its religious significance, Cohen is considered by some to be inappropriate to use as a first name, particularly by people with no Jewish heritage.

 Nevertheless, Cohen is becoming increasingly popular in the US as a first name for boys, possibly inspired by the character Seth on TV's The O.C. who was commonly called by his last name, Cohen. It currently ranks among the 300 most popular first names for American baby boys, boosted by its sleek and strong sound and proximity to more popular choices like Logan and Rowan.

 Cohen is also found in Ireland as a surname, an unusual variant of Coyne, Cowan or Coen. The Coen spelling is also a Dutch name in its own right, derived from Coenraad (Conrad), although in that case it rhymes with "moon".

Cohen

Relaxed, laid-back cowboy name with broad appeal and more staying power than you might guess: Dallas has ranked among the Top 1000 boy names in the US since records began in 1880.

Today, Dallas is increasingly a gender-neutral option, still given to three times as many baby boys as girls though the gap is narrowing. Still, Dallas's star as a boys' name continues to rise, up more than 100 places since the turn of the century.

For boys, Dallas might be considered one of those golden names that's trending but not trendy.

Dallas

Declan is the Anglicized form of the Irish name Deaglán. St. Declan was one of the first missionaries to bring Christianity to Ireland, preceding St. Patrick. Originally from Wales, he founded the monastery of Ardmore in Ireland.
 
Declan, the amiable and appealing name of an Irish saint (and the real first name of singer Elvis Costello), is very popular in the Emerald Isle and beginning its certain climb to popularity here, after debuting on the American list in 1998. Like Aidan and Liam, Declan is shaping up to be an American hit.
 
Declan Porter is a current character on Revenge. 
 Cyndi Lauper spelled her son's name Declyn.

Declan

Ellis is a former Old Man Name turned gender-neutral choice for the 21st century. It's one of the less used names in the currently popular El-family. 
 
 A popular Welsh name in its own right, sometimes spelled Elis, Ellis is also an English surname derived from Elijah, by way of the Greek Elias.
 Ellis Bell was the male pseudonym of Emily Bronte when she wrote Wuthering Heights. Ellis Marsalis is the paterfamilias of the noted jazz family, father of Wynton, Branford and others, and some might associate the name with Ellis Island, through which millions of immigrants entered the United States.
 There have been a number of Ellises on the big and small screen -- in The Wire, Grey's Anatomy and No Country for Old Men, among others. As a surname, it's associated with designer Perry, writer Bret Easton and psychologist Havelock.
 At one point all-male, Ellis is now a popular name for both boys and girls. Currently there are two baby boys named Ellis for every girl.

Ellis

Gideon is a no-longer neglected Old Testament name, but still makes an excellent choice for parents looking to move beyond such overused biblicals as Benjamin and Jacob. In the Old Testament, Gideon was a judge called on by God to rescue the Jews from the Midianites, and the name was popular among the Puritans.
 Gideon was given a spike by the short-lived TV series Gideon's Crossing, and has been heard more recently as a main character in Criminal Minds, as Molly Weasley's brother Gideon Prewett in the Harry Potter series, and as an anti-hero, Gideon Gordon Graves, in the Scott Pilgrim series.
 The ubiquitous, in-every-hotel-room Gideon bibles were named because Gideon symbolizes great work done by few people.
 Among the celebs who have chosen Gideon for their sons are Neil Patrick Harris and Ziggy Marley.

Gideon

Greyson and Grayson, nephews of Jason, are both on the fast track. Both variations have made their way all the way up to the Top 100 since 2016. Gray/Grey makes a nice nickname.

The name of the child in The Nanny Diaries is Grayer, and actor Tyler Christopher opted for the unusual spelling of Greysun for his son. Some parents are considering Grayson -- or Gracen or Gracyn -- for girls as an androgynous spin on Grace.

Greyson

Gatlin

Jace may sound like only half a name -- it's usually pronounced like the first half of Jason though some may consider it a spelling-out of the initials J. C. -- but it's a popular choice for baby boys. Jace has been heard on such TV shows as Teen Mom 2 and Duck Dynasty</e>.

Jace

JERAN

Aviation enthusiast John Travolta put this fast-paced name in the lexicon when he used it for his late son, and George Lucas followed suit. 

Jett might be a word name for a kind of airplane or for the mineraloid jet, typically black and shiny, giving rise to the term "jet black".

Jett

In the Old Testament, Joel was one of King David's 'mighty men' and the name was taken up by the Puritans of the sixteenth century. In the mid 1960s, Joel entered the Top 100, and stayed there for about twenty years, as parents tried to jazz up and formalize old standby Joe by reviving this biblical name.
 Current notable bearers include entertainer Joel Grey, half of the filmmaking Coen brothers, musician Joel Madden, and TV's Joel McHale. Joel Chandler Harris created Uncle Remus.

Joel

Jude is a modern star, maintaining a steady level of popularity -- but not TOO much popularity -- for more than a decade now. Thank Jude Law and the great Lennon-McCartney song "Hey Jude", double-handedly responsible for propelling Jude up the charts.
 Saint Jude was the apostle who interceded for people with problems and became the patron saint of lost causes.Kelsey Grammer has a son named Jude Gordon. Jude is occasionally used for girls (as in Martha Stewart's granddaughter)--but more often as a shortened form of Judith/Judy.
 Jude's old connections to the traitorous Judas Iscariot and Thomas Hardy's tragic Jude the Obscure have mostly faded from memory, though don't be shocked if Grandma objects to the name on these grounds.

Jude

Long popular in Ireland and England, Kieran, the name of Ireland's first-born saint and twenty-five other saints, has been building its U.S. fan base thanks to its strong and attractive sound, and its fashionable Irish brogue. While Ciaran is the more authentic Irish spelling, Kieran is more popular this side of the Atlantic. 
 Julianna Margulies chose Kieran for her son, and Kieran is a Culkin brother to Macaulay and Rory. Kier is an attractive short form, and Kiera/Keira is Kieran's girl twin.

Kieran

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

The graceful, natural image of the verdant shade tree transcends any connection with President Johnson.
 A sturdy tree that can live for centuries, Linden was actually quite a popular boys' name from the 1930s to the 1960s--as was the presidential spelling Lyndon--but has now become unisex.

Linden

Merritt is an old-style surname name that could be seen as a positive virtue name. It was used in the late 19th and early 20th century for boys, reaching the Top 400 in 1899, and is notable today for being one of the names most evenly divided between boys and girls. Emmy winner Merritt Wever helped popularize it for girls.



Merritt

Could join such up-and-comers as Miller and Gardener. 

Potter

Rhett has been more tied to Gone with the Wind than even Scarlett, but now we're hearing rumblings of its finding new and independent favor among parents, perhaps emboldened by the growing popularity of Scarlett. 
 In addition to being a powerful storyteller, author Margaret Mitchell was a great character namer as well—think Scarlett, Melanie, Ashley, and even the mansion Tara. Rhett emerged from the story as one of the ultimate dashing, romantic names—so much so that parents of the past didn't fully embrace it.
 Rhett is a South Carolina surname, brought to North America in 1694, and borne by a noted politician during the Civil War period, which may have inspired the author.

Rhett

Ronan is the compelling legendary name of twelve Irish and Scottish saints that is now drawing some deserved attention; this cousin of the ascending Roman and Rowan was chosen by actor Daniel Day-Lewis and his writer-director wife Rebecca Miller in 1998, and more recently by actress Catherine Bell.
 Ronan is a Harry Potter name—that of a centaur who lives in the Forbidden Forest. Ronan Keating is an Irish singer, Ronan Farrow is a TV personality and Hollywood scion, and its presence as a surname is represented by young actress Saoirse Ronan.

Ronan

Parents seeking alternatives to the overexposed Ryan have flocked to this soundalike name, which peaked at #146 in 2011. 

Rylan

See the popularity graph below for the name Theo? It's been heading straight uphill since 2010, when it hopped back onto the Top 1000 after a 60+ year absence.
 
Now in the Top 100 in this form, Theo's popularity is even wider given its common use as a nickname for Theodore, which made the Top 10 for the first time in 2022. This might be the generation of Theos.
 
Theo's newfound popularity extends far beyond the US and the rest of the English-speaking world. It's currently a Top 100 name in Germany, Brazil, Scandinavia, and beyond, as well as being a popular choice for pets.
 Theo first made an impact as the name of the only son on "The Cosby Show," earlier it was associated with Vincent van Gogh's supportive brother Theo.

Theo

Turner is a name that's both preppy and painterly, recalling the exquisite watercolor seascapes of British painter J.M.W. Turner. An occupational name in the Taylor-Carter mold, Turner is a more distinctive choice than many of the usual suspects.

 One first-name Turner namesake is Turner Catledge, the first Executive Editor of the New York Times, but for the most part its more notable bearers were surnamed Turner: Nat, the leader of a rebellion of enslaved people and subject of a William Styron novel; media mogul Ted; musicians Ike and Tina; and glamour girl Lana. In the movie Turner & Hooch, Tom Hanks was Det. Scott Turner and Hooch was the dog.

Turner

Western novelist Zane (born Pearl!) Grey made this name famous. Now, it's in tune with the style of our times, retaining that appealing cowboy image. 
 Zane Grey was the great-grandson of Ebenezer Zane, founder of Zanesville, Ohio, the town where the writer was born. The name Zane has been on the popularity list since 1921, the heyday of such Zane Grey novels as The Riders of the Purple Sage.
 The Arabic name Zayn, as in musician Zayn Malik, sounds exactly the same as Zane but has a different root. Zayn is one of the fastest-rising names in recent years. And some parents--including country singer Mindy McReady -- use the spelling Zayne.

Zane

daisy:)'s list "Stylish Boy Names" of 26 great name ideas: Allen - Zane!