Caius
How to say it: KYE-us · /ˈkaɪəs/
Ancient Latin praenomen Gaius meaning 'to rejoice' - borne by early saints and Shakespeare character
Caius was the 578th most popular boys’ name in the United States in 2025, given to 254 babies (Social Security Administration). The 2020s are its busiest decade so far, its births are up about 88% in ten years, and it is projected to rise to #467 by 2030.
Updated · SSA 2025 data, published May 2026 · How we compute these figures
Key facts
| Rank among boys’ names, 2025 | #578 |
|---|---|
| Babies born in 2025 | 254 |
| Share of births | 1 in 7,053 |
| Peak decade | 2020s |
| Change over 10 years | +88% |
| Projected rank for 2030 (estimate) | #467 |
Sources: Social Security Administration (SSA). How we compute these figures.
Its life, decade by decade
Almost all use of Caius has arrived in the last forty years. The 2020s find it at its peak and still moving upward.
What goes with it
Sharp and breathy at once, pronounced KYE us, Caius feels strong with a biblical undercurrent. Cassius and Titus sit nearby in style.
Nicknames
- Cai
- Kai
Honouring a Caius in the family
In the classroom
In a class of 25 children born in 2025, the chance that another child is called Caius is about under 1 in 200.
Around the world
This spelling is used in English, French, German.
Famous people named Caius
- Caius (?–296)Pope of the Catholic Church from 283 to 296
- Caius Welcker (1885–1939)Dutch footballer
- Caius Gabriel Cibber (1630–1700)British artist
From Wikidata and Wikipedia
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