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Last name Sauer (Sauer , ساور , Зауэр , along with others...) , in the world, is a common family name. The last name Sauer is habitual in Western Europe, particularly Germany, where it is quite a common surname, Austria, and Luxembourg, where it is quite a rare surname. In absolute terms, it most frequently occurs in Germany, the United States, and Brazil. Much less frequently, Sauer is the forename as well as the last name.