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Family name Napp (Napp , Nappe ) , throughout the world, is quite a rare cognomen. The family name Napp is habitual in Estonia, where it is quite a common surname, Germany, where it is quite a rare surname, and Argentina, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Brazil. Much less frequently, Napp is the forename as well as the last name.