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Family name Derr (德尔 , Derr , Дерр ) , in all the world, is a common surname. The surname Derr is habitual in Reunion, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and the United States. Not in comparison with a country's population, it most frequently occurs in the United States, Germany, and Kazakhstan. Much less frequently, Derr is the forename as well as the last name.