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