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Family name Dehn (德恩 , דן , Ден ) , globally, is a common cognomen. The last name Dehn is habitual in Israel, where it is quite a common surname, Denmark, where it is quite a rare surname, and Germany. Measured by absolute frequency, it is the most numerous in Germany, the United States, and China. Likewise, Dehn is the forename as well as the last name.