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Gender: Male Meaning of Caius: "rejoice" Origin of Caius: Latin

The name Caius is a boy's name of Latin origin meaning "rejoice". Caius and is often added to lists like Unique Boy Names: Unusual and Rare and discussed in our forums with posts like "Quick Question Thread?!".

From the experts:

Caius is classical and serious but also has a simple, joyful quality. There was a third century pope named Caius, as well as an early Christian writer, several Shakespearean characters, and a Twilight vampire. We would pronounce the name to rhyme with eye-us though at Cambridge University in England, where it's the name of a college, it's pronounced keys. Caius is currently Number 164 on Nameberry.

Nickname Cai is a definite asset.

Find other names based on Caius using our baby name generator.

Famous People Named Caius

Saint Caius, 3rd century Bishop of Milan
Caius, Presbyter of Rome, Christian writer
Caius Gabriel Cibber, Danish sculptor
Blessed Caius of Korea, Catholic missionary
Caius Welcker, Dutch footballer
John Caius, English physician and cofounder of Cambridge's Gonville and Caius College
Pope Caius, 3rd century Bishop of Rome
Caius Kane Denman (b. 2018), son of American film and television actor David Denman and Swedish-American actress Mercedes Mason

Pop Culture References for the name Caius

Caius, name taken by the Earl of Kent in Shakespeare's "King Lear"
Caius, main character in Shakespeare's "Coriolanus"
Caius, in the book "The Skystone" by Jack Whyte
Caius, character in the Twilight series
Caius Ballad, antagonist in the video game "Final Fantasy XIII-2"
Welsh variation Caian
Gonville & Caius College, University of Cambridge

Keye, Keys, Keyes, Cai, Kay, Caio, Kaye


indiefendi2 Says:


My mother thinks Caius sounds feminine (now that's what I call an unpopular opinion). Berries, what do you think? Caius on a girl?!

daniellerose92 Says:


My son is called Caius and we pronounce it "ky-uss". He has just turned 2 years old. A lot of people mispronounce it "Kay-us" and spell it Cauis. It doesn't bother me too much anymore. We call him Cai for short. I love his name regardless of how weird people think it is!

rami Says:


who is it pronounced? is it like Thai yus? this site should a pronunciation feature. it would be awesome

EW314 Says:


I really like Caius. It's one of the few majestic-sounding Latinate names in -us which I can actually see working on a modern boy/man. Cai would fit right in with his classmates.

Michaela Says:


I love this name so much. Cai would be a really cool nickname. It has Christian heritage without being too blatant like Isaiah or Samuel.

otheralix Says:


Kai-us, though Kay-us is just as good. Originally, it was pronounced like Gaius (Cs and Gs were the same), which has two common pronunciations (Guy-us and Gay-us). The "ai" in Latin is pronounced ah-ee and "u" is oo. So, you could say the original is somewhat like Kah-ee-oo-s, which just sounds like an elongated way to get to "kai-us."

cmwillard Says:


What's the pronunciation? im just confused because I've heard it pronounced several ways

indiefendi2 Says:


I love this name but it's starting to sound "callous" to me.