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Family name Traub (Traub , Трауб , טראוב ) , in all the world, is a common last name. The last name Traub is habitual in Germany, where it is quite a rare surname, Switzerland, and Israel. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Switzerland. Much less frequently, Traub is the forename as well as the last name.