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