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Surname Dittmar (Dittmar , Диттмар ) , around the globe, is a common family name. The family name Dittmar is characteristic of Germany, where it is quite a rare surname, Switzerland, where it is a rare surname, and the United States. In absolute terms, it most frequently occurs in Germany, the United States, and Brazil. Very seldom, Dittmar is the forename as well as the last name.