Cognomen ชายสิทธิ์ (ชายสิทธิ์ 
) , throughout the world, is a very rare surname. The last name ชายสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ชายสิทธิ์ is the forename as well as the last name.