Kaius
How to say it: KY-us · /ˈkaɪəs/
Variant of Latin Caius/Gaius, ancient Roman name possibly meaning 'to rejoice' - revived in modern use.
Kaius was the 578th most popular boys’ name in the United States in 2025, given to 216 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 | 216 |
| 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
A fresh presence on the charts, Kaius peaked in the 2020s. Still holding the peak, an upward path seems probable soon.
What goes with it
Crisp and breathy with a strong ancient feel and a biblical theme. Titus makes a fitting counterpart.
In the classroom
In a class of 25 children born in 2025, the chance that another child is called Kaius is about under 1 in 200.
Around the world
This spelling is used in English, Finnish.
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