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Family name Knappe (Knapp , Knappe , Кнаппе ) , across the world, is a common cognomen. The last name Knappe is characteristic of Austria, where it is quite a common surname, Germany, and Montenegro (explore the name in all countries). In absolute terms, it is the most numerous in the United States, Germany, and Austria. Much less frequently, Knappe is the forename as well as the last name.