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Family name Sitko (Sitko , Ситко , Ситько ) , throughout the world, is quite a common cognomen. The last name Sitko is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Poland, and Ukraine. Not in comparison with a country's population, this name is the most popular in Poland, Russia, and the United States. Also, Sitko is the forename as well as the last name.