Kai \kai\ as a boy's name (also used as girl's name Kai), is pronounced kye. It is of Welsh, Scandinavian and Greek origin, and the meaning of Kai is "keeper of the keys; earth". Variant of Kay. Also possibly (South African) "beautiful". Kai is also a Hawaiian name meaning "the sea".

Kai has 3 variant forms: Kaj, Keh and Kye.

Baby names that sound like Kai are Cai, Kaye, Caio, Gay, Kauai, Kawai and Key.