Family name แทนสิทธิ์ (แทนสิทธิ์ 
) , in the entire world, is an extremely rare cognomen. The last name แทนสิทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, แทนสิทธิ์ is the forename as well as the last name.