Cognomen Sumaen (Sumaen 
, สุแมน 
, ทรูแมน ) , in the entire world, is a very rare last name. The cognomen Sumaen is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Much more frequently, Sumaen is the forename as well as the last name.