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Family name Knapp (Knap , Knapp , Кнап , and others...) , globally, is a common surname. The cognomen Knapp is characteristic of Western Europe, particularly Austria, where it is quite a common surname, Liechtenstein, and Germany (explore the name in all countries). In absolute terms, it is commonest in the United States, Germany, and Poland. Very seldom, Knapp is the forename as well as the last name.