Cognomen กนกฤทธิ์ (กนกฤทธิ์ 
) , across the world, is an extremely rare last name. The cognomen กนกฤทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Also, กนกฤทธิ์ is the forename as well as the last name.