Cognomen คชาสิทธิ์ (คชาสิทธิ์ 
) , all around the world, is an extremely rare family name. The cognomen คชาสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, คชาสิทธิ์ is the forename as well as the last name.