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Cognomen Plein (Pelan , Plein , Plen ) , throughout the world, is quite a common last name. The cognomen Plein is characteristic of Suriname, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Slovenia. Measured by absolute frequency, it is the most numerous in the United States, Germany, and France. Much less frequently, Plein is the forename as well as the last name.