Family name ราชสาสน์ (Ratchasadh 
, ราชสาสน์ , Ratchasana ) , around the world, is a very rare cognomen. The surname ราชสาสน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ราชสาสน์ is the forename as well as the last name.