Family name สิทธิศิลป์ (สิทธิศิลป์ 
, Sittisil 
, Sitthisil) , throughout the world, is a very rare surname. The last name สิทธิศิลป์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, สิทธิศิลป์ is the forename as well as the last name.