Cognomen ปฐมศักดิ์ (ปฐมศักดิ์ 
, Pathomsak ) , worldwide, is a very rare family name. The family name ปฐมศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, ปฐมศักดิ์ is the forename as well as the last name.