Cognomen Boyy (บอย 
, Boyy 
) , throughout the world, is a rare last name. The surname Boyy is characteristic of South-eastern Asia, particularly Indonesia, where it is a rare surname, Thailand, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Indonesia, Thailand, and the United States. More prevalently, Boyy is the forename as well as the last name.