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What does Cai mean?

Cai Pronunciation of Cai [cai] as a boys' name (also used less generally as girls' name Cai) is of Welsh origin. Used as a respelling of Kai in Wales. The name of King Arthur's seneschal, Sir Kay. The origin of this name is uncertain, and may be linked to the Roman name Caius, or to the name of a Celtic god. It also means "female" in Vietnamese.

Associated with: king, roman.


Cai has 3 variants: Caio, Caw and Kai.

Affiliated boy name: Gaius.

5 more related forms via Caius, Kai: Kaj, Kay, Kaye, Keh and Kye.

Creative forms:
(male) Cava, Ghai, ..

(female) Cais, Co, ..

Middle name pairings:
Cai Lazarus (C.L.), ..

How popular is Cai?

Cai is a rare first name for males but a very popular surname for all people (#7178 out of 150436, Top 5%). (2000 U.S. Census)

Cai was first listed in 2015 and reached its apex rank of #1819 in the U.S. then. (Top 2000 Names, 2015)

Top 2000 baby names ranking of Cai name in U.S.

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

Which version is better?

with its variant forms and related boy names. Prominent related forms of Cai (#1819 from current records) are Kai (#145 from current records), Kye (#978), Caius (#1283), Kay and Kaye. Other variants, like Keh, are seldom used. Usage of these forms of Cai is common today (median #1370), except for the version Kay which have become somewhat dated. Kai and Kye are two of the more chic boy names here.

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

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

Similar Names

Cai is alike in pronunciation to Caeo, Cayo, Coe, Coy, Coye, Kauai, Kawai, Key and Koa. Other suggested similar names are Cain, Cal, Cam, Cap, Caz, Chai, Dai, Hai, Jai and Rai. These names tend to be more commonly used than Cai.