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Cognomen Siuko (Сивко , Siuko , Сиуко ) , globally, is quite a rare family name. The cognomen Siuko is habitual in Finland, where it is quite a common surname, Belarus, where it is quite a rare surname, and Kazakhstan, where it is a rare surname. In absolute terms, it most frequently occurs in Russia, Finland, and Belarus. Much less frequently, Siuko is the forename as well as the last name.