Cai \cai\ as a boy's name (also used as girl's name Cai), is a variant of Caius (Latin) and Gaius (Latin), and the meaning of Cai is "rejoice; happy, rejoice".

The baby name Cai sounds like Caio and Kai. Other similar baby names are Cain, Cal, Cam, Cap, Caz, Chai, Hai, Dai, Jai and Rai.