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Surname กายสิทธิ์ (กายสิทธิ์ , Kaiyasit , Kayasit ) , globally, is quite a rare cognomen. The surname กายสิทธิ์ is habitual in Laos, where it is quite a rare surname, Thailand, and Norway, where it is a very rare surname. In absolute terms, it is commonest in South-eastern Asia, particularly Thailand, Laos, and Malaysia. Likewise, กายสิทธิ์ is the forename as well as the last name.