Cognomen กรรณฤทธิ์ (Kansarit 
, กรรณฤทธิ์ , Karnyarit ) , around the world, is an extremely rare surname. The surname กรรณฤทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, กรรณฤทธิ์ is the forename as well as the last name.