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Cognomen Reiff (Reiff , レイフ) , in the world, is quite a common last name. The cognomen Reiff is characteristic of Luxembourg, where it is quite a common surname, Namibia, where it is quite a rare surname, and Germany. Measured by absolute frequency, it is the most numerous in the United States, Germany, and Poland. Much less frequently, Reiff is the forename as well as the last name.