Caius
Caius is a boys' name of Latin origin meaning “rejoice.” It ranked #927 in the United States in 2025. Caius (also spelled Gaius) is one of the oldest Roman praenomina, meaning 'to rejoice.'
Torn between Caius and another name? Ask family and friends to vote
how do you pronounce Caius?
KY-us
where does the name Caius come from?
An archaic Latin spelling of the praenomen Gaius. In early Latin the letter C stood for both the g and k sounds, so Gaius and Gnaeus were written Caius and Cnaius, and the spelling survived in inscriptions even after the letter G was introduced.
It was borne by Julius Caesar (Gaius Julius Caesar) and numerous other prominent Romans. The name appears in Shakespeare's plays and names a Cambridge college. It has an ancient gravitas with a surprisingly modern, sharp sound.
the history of Caius
Gaius Julius Caesar's own name was abbreviated as C·I·C, using this archaic C.
who are famous people named Caius?
- Gaius Julius Caesar (Roman dictator and military genius)
- Gonville & Caius College, Cambridge (prestigious English college)
how popular is this name?
Caius has appeared in the US top 1,000 in 1 year since 2025. It peaked at #927 in 2025.
See the milestone years
| Year | Rank |
|---|---|
| 2025 | #927 |
Source: SSA National Baby Names Dataset (through 2025). Years absent from the table are years Caius fell outside the top 1,000.
what are the nicknames and variants of Caius?
Variants around the world
what names are similar to Caius?
what names go well with Caius?
Sibling names that share Caius's rhythm and register without echoing it too closely.
quick answers about Caius
What does the name Caius mean?
Caius means “rejoice”.
What is the origin of the name Caius?
Caius comes from the Latin naming tradition. Related forms include Gaius.
How popular is the name Caius?
Caius ranked #927 in the US in 2025, according to Social Security data.
Is Caius a boy or girl name?
Caius is primarily a boys' name.
How do you pronounce Caius?
Caius is pronounced KY-us, with 2 syllables.
Last updated · Curated by HushName editorial
love Caius? get 10 more names curated for your family.
Popularity rankings and meanings are just the starting point. Our AI consultant finds names that match your heritage, style, and what matters most to you.
Completely free. No credit card required.
Start your free session