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Surname Кайо (Caio , Kaio , Kajo ) , in the entire world, is a common cognomen. The family name Кайо is characteristic of Albania, where it is quite a common surname, Estonia, where it is quite a rare surname, and Portugal. Not in comparison with a country's population, it is commonest in Japan, Egypt, and Brazil. More frequently, Кайо is the forename as well as the last name.