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Family name Dillen (Dillen , ديلين , דילן ) , around the globe, is quite a rare cognomen. The family name Dillen is characteristic of Belgium, where it is quite a common surname, Netherlands, where it is quite a rare surname, and North Macedonia, where it is a rare surname. In absolute terms, it is the most numerous in Belgium, Netherlands, and the United States. Much less frequently, Dillen is the forename as well as the last name.