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Cognomen Betz (Betz , Бетц , بيتز) , worldwide, is a common last name. The cognomen Betz is habitual in Germany, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and the United States. Measured by absolute frequency, it is the most numerous in Germany, the United States, and France. Much less frequently, Betz is the forename as well as the last name.