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Surname Sinko (Sinko , Синько , Синко ) , all around the world, is quite a common last name. The family name Sinko is habitual in Hungary, where it is quite a common surname, Slovenia, and Ukraine, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Russia, Ukraine, and Hungary. Very seldom, Sinko is the forename as well as the last name.