Cognomen สมสิทธิโชค (สมสิทธิโชค 
, Somsittichock ) , all around the world, is a very rare last name. The last name สมสิทธิโชค is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, สมสิทธิโชค is the forename as well as the last name.