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Family name Siika (Sik , Сийка , Siika ) , in all the world, is a common last name. The family name Siika is characteristic of Bulgaria, where it is quite a common surname, Taiwan, where it is quite a rare surname, and Hungary. In absolute terms, it is the most numerous in Bulgaria, China, and South Korea. Likewise, Siika is the forename as well as the last name.