In the entire world, काय (កាយ 
, กาย 
, Kayak 
) is quite a rare unisex first name. The first name काय is characteristic of South-eastern Asia, particularly Cambodia, where it is quite a common gender-neutral name, Thailand, where it is a rare gender-neutral name, and Indonesia, where it is a very rare male name. In absolute terms, it is the most numerous in Cambodia, Thailand, and India. Also, काय is the last name as well as the forename.