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Family name Ruder (Rudel , Ruder , 鲁德 ) , in all the world, is quite a common cognomen. The family name Ruder is characteristic of Reunion, where it is quite a common surname, Germany, where it is quite a rare surname, and Switzerland. Measured by absolute frequency, it is the most numerous in Germany, the United States, and France. Also, Ruder is the forename as well as the last name.