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Family name Сиян (Sijan , Siyan , Siian ) , around the world, is quite a common last name. The last name Сиян is habitual in Serbia, where it is quite a common surname, Qatar, where it is quite a rare surname, and Bosnia and Herzegovina. Measured by absolute frequency, it most frequently occurs in Bangladesh, Serbia, and India. Likewise, Сиян is the forename as well as the last name.