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Caius meaning, boyCaius

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Meaning and name origin

Caius \caius\ as a boy's name is pronounced keys. It is of Latin origin, and the meaning of Caius is "happy". Common Roman form of Gaius. This was the name of the infamous Roman emperor called Caligula, a nickname meaning "little boots". This referred to the minature soldier's footwear he wore when he was young. A 16th-century English physician endowed a college at Cambridge University called "Gonville and Caius".

Caius has 7 variant forms: Cai, Caio, Kay, Kaye, Keye, Keyes and Keys.


Caius is not a popular first name for males and an equally uncommon surname or last name for all people (2000 U.S. Census).

Displayed below is a comparison of the popularity of the boy name Caius and its variant forms. The only variation form ranked in the Top 1000/100 is Kay. (2015 statistics).

Top 1000 baby names ranking of Kay in U.S.

Top 100 baby names ranking of Caius and related baby names outside U.S.

Similar Names

Caius is also pronounced similarly to Cass. Like Caius, this name is not commonly used.


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