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Last name Karpfen (Karp , Karpfen ) , all over the world, is a common surname. The cognomen Karpfen is habitual in Estonia, where it is quite a common surname, Moldova, where it is quite a rare surname, and Barbados. In absolute terms, the name is most common in the United States, Germany, and Poland. Also, Karpfen is the forename as well as the last name.