Cael is the name of the angel of the zodiac sign of Cancer and also of a warrior of Irish mythology. Its ascendance to the Top 1000 over the past decade probably has to do with its similarity to Cale and Kale (and Kyle and Cayden etcetera).

Cael

A recently created member of the Cale family, with a trendy unisex aura. 

Calen

CALIBURN

CALIDORE

Calix is once-obscure name that is starting to see some use in the US, where 47 baby boys were named Calix in 2023. An indirect influence is the actress Calista Flockhart, who introduced Americans to the female version of this attractive Greek name to prominence.
 
Calix derives from the Latin word for chalice, calyx, which in turn came from the Ancient Greek word kálux, meaning "husk" or "pod." It is also considered a diminutive of Calixtus, a variation of the Late Roman name Callistus meaning "most beautiful." Calyx can also be spelled Calyx, as in the funnel or chalice-shaped part of a flower.

Calix

Callixte

Callum, a charming Scottish name high on the list in England, Scotland and Northern Ireland, is rising through the ranks in the US now too. And it comes complete with the easy nickname Cal. Kyle MacLachlan chose Callum for his son. Callum might also be spelled Calum; in Ireland, the name became Colm, and in Scotland it's sometimes used as a pet form of Malcolm.
 
Callum was derived from Latin Columba, a unisex given name meaning "dove." Callum was popular among early Christians because the dove was a symbol of purity, peace and the Holy Spirit. St. Columba was one of the most influential of the early Celtic saints.

Callum

CANDELARIO

Cannon sits amongst other weapon names like Colt, Pistol, Lance, and Remington. Definitely a name that offers bombast.

Cannon

An ancient Celtic name worn by one of the Knights of the Round Table, as well as a semi-legendary Welsh King.

Caradoc

CARNELIAN

Cashel is one of the many appealing <a href="https://nameberry.com/baby-names/168/irish-names">Irish names</a> that have not yet emigrated to the US. Cashel was chosen by actor Daniel Day-Lewis and his writer-director wife Rebecca Miller for their son. 
 In Ireland, Cashel refers to a circular stone fort. It is the name of a town in Tipperary and the protagonist of the George Bernard Shaw novel Cashel Byron's Profession.
 The Cash sound feels especially contemporary and appealing now, with Cashel joining such stylish brothers as Cassius, Cassian, and Cash.

Cashel

Casimir, a traditional name of Polish kings, could do quite well these days as we see the rise of Caspian, Cassius, Castiel, et. al. Like Leopold and Laszlo, Casimir is strong and worth considering if you've got an adventurous streak — and bet your son will too. An alternative commonly cited meaning that modern parents might prefer is "proclaimer of peace". The traditional Polish spelling of the name is Kazimir.

Casimir

One of the most romantic of appellations, Caspian is a geographical name referring to the large salty sea between Asia and Europe. It's also the name of the hero of C.S. Lewis's beloved Chronicles of Narnia, Prince Caspian. 
 
The name Caspian is ultimately derived from the Latin term Caspii, meaning "white." Caspii was the name of the people of Central Asia who were originally from Caucasus. 
 
Caspian is attracting a lot of attention from cutting-edge parents these days. It fits in with several trends as a name from classic children's literature, a water-related place name, and an ancient name with the trending Cas- beginning, ala Cassius and Cassian.

Caspian

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

Forget the oil. It's one of the twins that make up the constellation Gemini, and a mythological name on the cutting-edge of fashion; used by Metallica's James Hetfield. 

Castor

Cathan is one Irish boys' name that remains underused and would be an intriguing way to honor an ancestral Catherine. It is related to Cain and, theoretically, the nouveau Cayden.


Cathan

Bearded, fusty name of great old Roman lyric poet; just what the bold vanguard baby namer might be looking for. 

Catullus

Once a powerful Roman clan name, Cecil has lost much of its potency over the years, though it retains a strong presence in the sports and jazz worlds. Past bearers include film giant Cecil B. DeMille, poet Cecil Day Lewis, father of Daniel, and photographer Cecil Beaton. Fictional Cecils appear in Oscar Wilde's play, Lady Windemere's Fan, E. M. Foster's A Room With a View and the film Lee Daniel's The Butler.

Cecil

Roman statesman's name with a cool and quirky sound. Marcus Tullius Cicero was a Roman scholar, orator and lawyer who had an immense impact on the Latin language. 

Cicero

This name of an old Hollywood nightclub still retains a spark of glamour. 

Ciro

Cole -- a short name that embodies a lot of richness and depth -- has long been associated with the great songwriter Cole Porter. It's quite popular in Scotland.
 Old King Cole -- which refers to a real British king -- is familiar to all kids. Cole was the name of the child in The Sixth Sense and was also the name of -- sorry -- the notorious outlaw Cole Younger, who was born Thomas Coleman.

Cole

Colm is a popular <a href="https://nameberry.com/list/328/irish-baby-names-for-boys">Irish name for boys</a> that could immigrate, especially with its peaceful meaning. Colm Toibin is a contemporary Irish novelist and critic, author of The Master and Brooklyn; Colm Meaney is an Irish actor. Pronunciation is two syllables instead of one, like Colin with an 'm' at the end. Colm is related to Columba, Colom, Colum, Callum, and Malcolm.

Colm

CORIANDER

COTTUS

The title of a Shakespeare play based on legends featuring the early Celtic King Cunobelinus, whose name derives from the Gaulish sun god Belenus.

Cymbeline

octobertales's list "C - Boys' Names" of 26 great name ideas: Cael - Cymbeline!