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Surname Knap (Knap , Knapp , Кнап ) , in all the world, is a common family name. The family name Knap is habitual in Western Europe, particularly Austria, where it is quite a common surname, Liechtenstein, and Germany (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, Germany, and Poland. Very seldom, Knap is the forename as well as the last name.