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Cognomen Diener (Diener , 迪纳 , Динер ) , all around the world, is a common surname. The surname Diener is characteristic of Switzerland, where it is quite a common surname, Namibia, where it is quite a rare surname, and Germany. Measured by absolute frequency, it is commonest in Germany, the United States, and Switzerland. Much less frequently, Diener is the forename as well as the last name.