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Surname Klett (Klett , Клетт ) , throughout the world, is quite a common last name. The cognomen Klett is habitual in Germany, where it is quite a rare surname, Norway, and Cameroon, where it is a rare surname. In absolute terms, this name is the most popular in Germany, the United States, and Cameroon. Very seldom, Klett is the forename as well as the last name.