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Family name Riedl (Riedl , ريدل , רידל ) , worldwide, is a common surname. The surname Riedl is characteristic of Austria, where it is quite a common surname, Germany, and Eswatini. Not in comparison with a country's population, the name is most common in Germany, Austria, and the United States. Very seldom, Riedl is the forename as well as the last name.