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What does Caio mean?

Caio /caio/ as a boys' name. Caio's name origins are Welsh and Latin, and the meaning of Caio is "happy". Caio is an alternate spelling of Caeo (Welsh) with the suffix -io. Caio is also a variation of Cai (Welsh). Caio is also used as a derivative of Caius (Latin) and Gaius (Latin).

Associated with: happy.


Caio has 6 variants: Caw, Cayo, Kai, Kay, Kaye and Keye.

Kreatif forms:
(male) Caiot, Cario, ..

(female) Caiois, Cais, ..

How popular is Caio?

Caio is an uncommonly occurring first name for men. Caio is an unusual last name too for both adults and children. (2000 U.S. Census)


Ranking and usage % can show different trends depending on the distribution of names that year.

Below is a graphed comparison of the history of Caio and associated names. Popular variation forms of Caio (not in Top 2000) are Kai (#177 in recent rankings), Caius (#1375), Kaye and Kay. Other forms, like Caw, are uncommon. These relations of Caio were popular as birth names in 2014 (median #1388), except for the form Kay which have become somewhat outmoded. Kai is the most contemporarily stylish name for newborns among these. (Top 2000 Names, 2014)

Top 2000 baby names ranking of Caius, Kai, Kay, Kaye in U.S.

Top 100 baby names ranking of Kai outside U.S.

Similar Names


Caio is pronounced similarly to Coe, Coy and Coye. Other recommended names are Ario, Cabe, Cabot, Cace, Cade, Cadmo (see Cadmus), Cadoc, Cadog, Cadon, Cael, Caide, Caidon, Caile, Caily, Cain, Caine, Caird, Cairn, Cairo, Caje, Cal, Cale, Cam, Camilo, Canon, Cap, Capp, Card, Carl, Carlo, Caron, Carr, Cary, Case, Cash, Cason, Cass, Cassio, Cato, Cayto, Caz, Celio, Chai, Chaim, Chairo, Chano, Chayo, Chic, Chico, Chik, Chiko, Chip, Chiro, Cid, Ciro, Clair, Claro, Cleo, Como, Craig, Craik, Crain, Cris, Dacio, Dario, Ezio, Fabio, Favio, Mario, Pio, Rio and Tavio. These names tend to be more commonly used than Caio.