Surname สุทธรัตน์ (สุทธรัตน์ 
, Suttarat ) , in all the world, is a very rare family name. The family name สุทธรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, สุทธรัตน์ is the forename as well as the last name.