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Surname Knopp (Knopp , Nuppu , Knoppe ) , throughout the world, is a common family name. The family name Knopp is characteristic of Germany, where it is quite a rare surname, Czechia, and Slovakia. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Brazil. Very seldom, Knopp is the forename as well as the last name.