Globally, กายสิทธิ์ (กายสิทธิ์ 
, Kaiyasit 
, Kayasit 
) is a rare dominantly male, but infrequently female forename. The forename กายสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare dominantly masculine, but infrequently female name. Also, กายสิทธิ์ is the last name as well as the forename.