Adler is a German-Jewish surname that is beginning to be used occasionally as a first and is among the stylish new <a href="https://nameberry.com/baby-names/494/german-names-for-boys">German names for boys</a>. Among the distinguished bearers of Adler as a last name are Freud colleague Alfred Adler, actress and influential acting teacher Stella Adler and Guns N' Roses drummer Steve Adler.

Adler

Better than Capricorn or Cancer, not as usable as Leo, the name of the Roman god of war becomes more possible as a baby name every day, as mythological names take the place of biblical names. 

Aries

Avi, the short form of many Hebrew names, is often used on its own in Israel. It entered the US Top 1000 for the first time in 2015.

Rugged but gentle at the same time, Cassian is a saintly and stylish choice that was derived from the name Cassius. Before 2017, it was an obscure choice, given to a tiny handful of boys each year. As of 2023, however, it's become one of the top ten fastest-rising names in the US, more than doubling in usage since 2022 and edging closer towards the Top 500.
 There are a number of fourth and fifth century St. Cassians, one of whom is the patron saint of stenographers (though he must not get much work these days).John Cassian was a monk and ascetic writer who introduced Eastern monasticism into the West; Cassian Elwes is a British film producer, and Patrick Wilson used the alternate spelling Kassian for his son.
 It is unlikely however, that any of these can be credited for the rise of Cassian. Instead, we must turn to pop culture.
 In 2016, just before Cassian began to climb the charts, the Star Wars Franchise movie, Rogue One, was released and included a character called Cassian Andor, who then went on to feature as the lead in the television spinoff series, Andor. With the sounds of popular Julian, Jasper, and Adrian, like Casper but not too ghostly, Cassian caught people's attention, not just in the US, but in the UK, where it now ranks in the Top 600.
 
But what caused the even bigger leap up the charts in 2023? Again, we must look towards a fictional character. The popular romance-fantasy book series A Court of Thorns and Roses by Sarah J. Maas features a Cassian, and the latest novel included a Cassian storyline that likely put the name on people's radar. "ACOTAR" as it gets called is popular on BookTok and BookTube so it's no wonder parents are taking inspiration from it. 
 Similar to Nameberry favorite Caspian with sounds that are both strong and soft, both ancient and right up to date, Cassian is a hot name right now, and was given to more than 550 babies in 2023.

Cassian

Conrad has a somewhat intellectual masculine image, a solid name that has been consistently on the popularity lists, especially well used in the 1920s and 30s, and given a pop of rock energy by the Elvis-like character of Conrad Birdie in Bye, Bye, Birdie--("We love you Conrad, oh yes we do!").
 Conrad has been both a saints' name and a German royal appellation. One of its most well-known bearers is hotelier Conrad Hilton, great-grandfather of the Paris generation. Conrad was the prototypical Byronic hero of his poem "The Corsair." There have been fictive Conrads on shows like Weeds and CSI.
 Corrado is the attractive Italian form.

Conrad

Eamon is one of the traditional <a href="https://nameberry.com/baby-names/168/irish-names">Irish names</a> that has not yet emigrated to the US. This Irish name pronounced ay-mon was popularized by early president of the independent republic Eamon de Valera (birth name George), who was born in the United States to an Irish mother and a Cuban father. Eamon definitely has possibilities as a successor to the epidemically popular Aidan/Aiden.
 Though it may be an older generation name in Ireland, it would sound fresh elsewhere.
 The original spelling of the name is Eamonn.

Eamon

Emmerich

If you're looking for a Welsh name less common than Dylan, Griffin, Evan, or Morgan, you might want to consider this offbeat epithet of the wise wizard Merlin. 

Root name Ambrose is an ancient saints' name derived from the Greek ambrosia, the food and drink of the gods that conferred immortality.

Emrys

Finnigan is another way to spell Finnegan, one of the energetic Irish surname-names in vogue now. One note: While Finnigan, Finnian, Finley and so on are appealing names on their own, you don't need to use a longer form to get to Finn, which is a perfectly proper name all on its own.

Finnigan

Gerard is currently in style limbo, after reaching peak popularity in the 1950s. With its strong meaning and gentle sound, it may be back in a generation or two. But for now, a boy called Gerard will likely be the only one in his class...unless you live in Catalonia, where it was recently in the Top 10.

Gerard

Hollis is a rugged, gentle and quietly used name, given to over 200 boys and 150 girls each year in the US. In 2023, it became one of the newest entries to the US Top 1000, where it fits in with the surnames-as-first-names trend, and other familiar choices like Ellis, Silas, and Holden. 
 
Derived from the English surname meaning "near the holly bushes", it has a number of notable connections. Hollis Thompson is a professional basketball player; Hollis Watkins is a Civil Rights activist in Mississippi; Pete Hollis was a community folk hero; and "The Ballad of Hollis Brown" is a popular Bob Dylan song.
 Combining woodsy sounds and outdoorsy vibes with a surname-y and smart style, Hollis feels sleek and preppy, but adventurous and spirited too.

Hollis

A somewhat stiff and serious turn-of-the-last-century name that seems to be coming back to life. Brendan Fraser chose it for his son in the mid-2000s. Leland Stanford was the founder of Stanford University and one-time Governor of California.

Leland

This concise one-syllable name, has two possible derivations and two positive meanings associated with it. In Hebrew, it means "heart", while in Russian it means "lion". So strong and simple Lev has both a soft and a fierce side.

 Lev is very uncommon in the US, ranking below the Top 1000, but feels eminently wearable thanks to similar names like Levi and Zev. It's a popular choice in Russia and the Netherlands, ranking in or around the Top 100 in both nations.

 The leonine Lev is the Russian birth name of the great novelist Tolstoy, and the mother of Liev Schreiber has stated that she named him in honor of the writer. In the Chaim Potok novel My Name is Asher Lev, about a Hasidic Jewish boy in New York, Lev is the character's surname.

 Actress Candace Cameron has a son she named Lev.

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

More obscure Irish surname-name, also spelled Molloy, that's prime for use.

Malloy

Morris is as quiet and comfortable as a Morris chair, and has the same vintage feel. Once a Top 100 name in the early 1900s, Morris fell completely off the roster in 1995, probably due to lingering fallout from his identification with Morris the cat's ("the world's most finicky cat") 9 Lives cat food commercials.
 A more distingushed namesake is Morris (Mo) Udall, an influential congressman, and, from literature, Morris Townsend in the Henry James novel Washington Square, which was made into a movie titled "The Heiress," with Montgomery Clift playing the part.
The usual nicknames for Morris are Morrie/Maury or Moe; a more distinctive one would be Moss. Morrie Schwartz, subject of the bestseller Tuesdays with Morrie was born Morris.

Morris

Orion is a rising star, with both mythical and celestial overtones.
 The Greek mythological Orion was the legendary hunter who pursued the seven daughters of Atlas, was slain by the goddess Artemis, and then placed as one of the brightest constellations in the night sky by Zeus.
 Mark Twain had a brother named Orion, and Chris "Big" Noth picked the name for his son. It is also a Harry Potter name.
 Orion's Gaelic connection to O'Ryan/Ryan makes it familiar as well as unusual.

Orion

This simple, elegant name offers something for many kinds of parents, from writers and history buffs to photographers to Pennsylvania dwellers. Most famous bearers are comedian Penn Jillette and Gossip Girl hottie Penn Badgley, both of whom were given this distinctive name at birth. Long obscure, Penn seems destined for greater usage.
 More familiar as a surname, Penn has had a number of distinguished bearers, including Pennsylvania founder William, director Arthur, photographer Irving, and actor/activist Sean.

Penn

Perrin has been in long use as a surname, derived from Peter, and is now used quietly as a first name. It may rise higher now that it's a character name in the popular TV adaptation of Robert Jordan's fantasy novel series The Wheel of Time.

Perrin

A name with some sterling qualities, most associated with the British currency and silver markets. Sterling has several recent TV associations, with characters Roger Sterling (on Mad Men) and Sterling Archer (on Archer), and actor Sterling K. Brown (on This is Us).

Sterling

This short but strong name, commonly heard in Israel, has a lot of crossover potential, and is among the most usable on the minuscule menu of U names. 
 The are two Uris in the Old Testament--the father of Bezalel, an artisan blessed with the skill to create the meeting tent and ark of the covenant for Moses, and the father of Geber, one of the twelve officials who provided nourishment for Solomon. Uri is a symbolic name for boys born on Hanukkah. 
Notable bearers: Uri Geller, self-proclaimed paranormalist known for his spoon bending on "The Tonight Show;" and prize-winning children's book writer and illustrator Uri Shulevitz. 
Longer related names: Uriah, the archangel, and Uriel.

masterquill's list "Boy Names with Flare" of 21 great name ideas: Adler - Uri!