BabyNameLens · Girl names · Boy names

Caius

“Variant of Gaius — rejoicing (from Proto-Indo-European *geh₂w- 'to rejoice')” — Latin (praenomen; archaic spelling of Gaius) origin

Boy's name · #927 in the US (2025) · Trending

Caius has appeared in US records since 1994 — best rank #927 (2025) · 2,329 babies named Caius all-time · 1 in 6,700 boys born in 2025.

Around the world: about 1 in 2,800 boys in N. Ireland (2025) · about 1 in 7,900 boys in Canada (2024) · about 1 in 8,800 boys in England & Wales (2025).

Appears in 2020-2025 birth records of 20 states. See the full state-by-state map on this page.

Famous Caiuses

Caius — pope of the Catholic Church from 283 to 296
Caius Welcker — Dutch footballer (1885-1939)
Caius Furius Pacilus Fusus — 5th-century BC Roman statesman and consul
Caius Gabriel Cibber — British artist (1630–1700)
Caius Iacob — Romanian politician and mathematician (1912-1992)

In stories & tradition

Caius Prenlomnibus — Asterix

What Caiuses become

Among 27 notable people named Caius:

Political leaders appear 2.16× more often than among typical names — e.g. Caius Furius Pacilus Fusus, 5th-century BC Roman statesman and consul.

Browse more boy names — popularity, trends and eras for 5,700+ American names, free.