Cognomen กัญญาสิทธิ์ (Kanyasit 
, กัญญาสิทธิ์ ) , around the world, is a very rare family name. The last name กัญญาสิทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, กัญญาสิทธิ์ is the forename as well as the last name.