Surname สุทธิดารัตน์ (สุทธิดารัตน์ 
, Sutidarat , Suttidarat ) , around the world, is an extremely rare family name. The family name สุทธิดารัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Predominantly, สุทธิดารัตน์ is the forename as well as the last name.