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Surname Gielen (Gielen , גילן , جيلين ) , across the world, is quite a common cognomen. The cognomen Gielen is characteristic of Western Europe, particularly Belgium, where it is quite a common surname, Netherlands, and Luxembourg, where it is quite a rare surname. In absolute terms, the name is most common in Western Europe, particularly Belgium, Netherlands, and Germany. Very seldom, Gielen is the forename as well as the last name.