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Cognomen Bylen (Bylen , Билен ) , in the entire world, is a rare family name. The family name Bylen is characteristic of Belgium, where it is a rare surname, Sweden, and Germany, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Belgium, Russia, and Germany. Very seldom, Bylen is the forename as well as the last name.