Family name カーヤ (Caja 
, Kaja 
, カーヤ) , in the entire world, is a common surname. The family name カーヤ is characteristic of Albania, where it is quite a common surname, Slovenia, and Peru. Not in comparison with a country's population, it most frequently occurs in India, Peru, and Malaysia. Likewise, カーヤ is the forename as well as the last name.