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Last name Knopf (Knop , Knopf , Кнопф ) , in the entire world, is a common family name. The last name Knopf is characteristic of Germany, where it is quite a common surname, Czechia, where it is quite a rare surname, and Poland. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Brazil. Much less frequently, Knopf is the forename as well as the last name.