In all the world, Wanhasan (วันฮูเซ็น 
, Wanhasan 
) is a very rare dominantly masculine, but infrequently girly first name. The forename Wanhasan is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare predominantly male, but very seldom girly name. Much less frequently, Wanhasan is the last name as well as the forename.