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.
how do you pronounce Caius?
KY-us
Hear it spoken aloud with our AI pronunciation tool.
what does Caius mean?
The name Caius means “rejoice.” It comes from the Latin language tradition.
Caius (also spelled Gaius) is one of the oldest Roman praenomina, meaning 'to rejoice.' 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.
where does the name Caius come from?
Wiktionary and Wikipedia agree Caius is 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 this spelling persisted in inscriptions even after G was introduced. Neither source gives an etymological meaning for the name, so the 'to rejoice' gloss given elsewhere is not confirmed by anything found here.
the history of Caius
Wikipedia notes that Gaius Julius Caesar's own name was abbreviated as C·I·C, using this archaic C spelling, tying the form directly to one of history's best known Romans; nothing here confirms the Shakespeare or Cambridge-college claims found elsewhere.
how popular is this name?
| Year | Rank |
|---|---|
| 2025 | #927 |
Source: SSA National Baby Names Dataset
what are the nicknames and variants of Caius?
Variants around the world
who are famous people named Caius?
- Gaius Julius Caesar (Roman dictator and military genius)
- Gonville & Caius College, Cambridge (prestigious English college)
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.
Last reviewed April 30, 2026 · Curated by HushName editorial
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