Cognomen Caiya (彩亚 
, 彩雅 , Caiya 
) , around the world, is quite a rare last name. The cognomen Caiya is habitual in India, where it is a rare surname, China, where it is a very rare surname, and South Africa. Not in comparison with a country's population, it is the most numerous in India, China, and Indonesia. Also, Caiya is the forename as well as the last name.