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Family name Koyen (Koyen , Коен ) , throughout the world, is a rare cognomen. The last name Koyen is characteristic of Belgium, where it is quite a rare surname, Bulgaria, and Kyrgyzstan, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Belgium, Russia, and the United States. Very seldom, Koyen is the forename as well as the last name.