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Surname Grun (Groen , Grun , Groene ) , all over the world, is a common cognomen. The family name Grun is habitual in Netherlands, where it is quite a common surname, Luxembourg, and Denmark, where it is quite a rare surname. In absolute terms, it most frequently occurs in Netherlands, Germany, and the United States. Much less frequently, Grun is the forename as well as the last name.