Cognomen ยลสิทธิ์ (ยลสิทธิ์ 
, Mitasit ) , globally, is a very rare family name. The surname ยลสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ยลสิทธิ์ is the forename as well as the last name.