Cognomen พระสมศักดิ์ (พระสมศักดิ์ 
, Phrasomsak , Prasomsak ) , in the world, is a very rare family name. The last name พระสมศักดิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, พระสมศักดิ์ is the forename as well as the last name.