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Last name كايوس (Kaio , Caius , كايوس) , globally, is quite a rare family name. The cognomen كايوس is characteristic of Estonia, where it is quite a rare surname, Romania, and New Zealand, where it is a rare surname. In absolute terms, it most frequently occurs in Nigeria, Kenya, and Romania. Much more frequently, كايوس is the forename as well as the last name.