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Family name Seidel (Seidel , Situla , Sejdel ) , around the world, is a common last name. The cognomen Seidel is habitual in Western Europe, particularly Germany, where it is quite a common surname, Austria, where it is quite a rare surname, and Luxembourg. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Brazil. Very seldom, Seidel is the forename as well as the last name.