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In the entire world, カーヤ (Caja , Kaja , カーヤ) is a common unisex first name. The forename カーヤ is characteristic of Slovenia, where it is quite a common girly name, Croatia, where it is quite a common dominantly feminine, but seldom male name, and Poland, where it is quite a rare feminine name. In absolute terms, it most frequently occurs in India, Poland, and Saudi Arabia. Also, カーヤ is the last name as well as the forename.
カーヤ is also a name for the fictitious and mythical characters: Каја , character in Čedomir Ilić: a novel; Цаја , character in Spent words; Kaja , the protagonist in Erik Poppe's "U – July 22" and Kaja Nord .