Cognomen Ratya (รัตยา 
, Ratya 
) , in the entire world, is a rare last name. The surname Ratya is characteristic of South Africa, where it is a rare surname, Thailand, and Indonesia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in India, South Africa, and Indonesia. More prevalently, Ratya is the forename as well as the last name.