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Surname Riedel (Riedel , ريدل , Ридель ) , worldwide, is a common last name. The last name Riedel is characteristic of Germany, where it is quite a common surname, Austria, where it is quite a rare surname, and Namibia. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Argentina. Very seldom, Riedel is the forename as well as the last name.