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Last name Sax (Sax , サックス , Сакс ) , in all the world, is quite a common family name. The surname Sax is habitual in Western Europe, particularly Switzerland, where it is quite a rare surname, Austria, and Luxembourg. Measured by absolute frequency, it is commonest in Germany, the United States, and Switzerland. Much less frequently, Sax is the forename as well as the last name.