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Family name Klug (Kluge , Klug , Клуг ) , around the world, is a common cognomen. The surname Klug is characteristic of Germany, where it is quite a common surname, Austria, and Estonia, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Brazil. Very seldom, Klug is the forename as well as the last name.