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Surname Gülen (Gülen , גולן , 葛兰 ) , in the world, is a common last name. The surname Gülen is characteristic of Israel, where it is quite a common surname, Turkey, and Denmark, where it is a rare surname. Not in comparison with a country's population, it is commonest in Turkey, Israel, and Germany. Much less frequently, Gülen is the forename as well as the last name.