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Surname Кёппен (Koeppen , Köppen , Кёппен) , in all the world, is quite a common cognomen. The last name Кёппен is characteristic of Germany, where it is quite a rare surname, Denmark, and Austria, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Denmark. Very seldom, Кёппен is the forename as well as the last name.