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Surname Kiryak (Киряк , Кирьяк , Kiryak ) , across the world, is a rare cognomen. The surname Kiryak is characteristic of Bulgaria, where it is quite a rare surname, Belarus, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, it most frequently occurs in Russia, Bulgaria, and Kazakhstan. Also, Kiryak is the forename as well as the last name.