Cognomen กัลยาสิทธิ์ (กัลยาสิทธิ์ 
, Kanlayasit ) , throughout the world, is a very rare last name. The surname กัลยาสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, กัลยาสิทธิ์ is the forename as well as the last name.