Surname ถิรสุทธิ์ (ถิรสุทธิ์ 
) , worldwide, is a very rare family name. The surname ถิรสุทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ถิรสุทธิ์ is the forename as well as the last name.