Family name สมบูรณ์ศักดิ์ (สมบูรณ์ศักดิ์ 
, Sombunsak ) , in the world, is a rare cognomen. The cognomen สมบูรณ์ศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Also, สมบูรณ์ศักดิ์ is the forename as well as the last name.