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Family name Geisel (Geisel , Giesel , جيزل ) , all over the world, is quite a common last name. The family name Geisel is characteristic of Germany, where it is quite a rare surname, Nicaragua, and Switzerland. Measured by absolute frequency, it is commonest in Germany, the United States, and Brazil. Very seldom, Geisel is the forename as well as the last name.