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Surname Cassel (Cassel , كاسل, קאסל , among others...) , in the entire world, is quite a common family name. The last name Cassel is habitual in Sweden, where it is quite a rare surname, Israel, and the United States. Measured by absolute frequency, it most frequently occurs in the United States, Brazil, and Germany. Very seldom, Cassel is the forename as well as the last name.