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Last name Erdmann (Erdmann , Эрдман , Эрдманн ) , around the world, is a common cognomen. The last name Erdmann is characteristic of Germany, where it is quite a common surname, Namibia, where it is quite a rare surname, and Denmark. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Brazil. Very seldom, Erdmann is the forename as well as the last name.