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Surname Demont (Demont , ديمون , Демон ) , worldwide, is quite a rare cognomen. The surname Demont is habitual in Western Europe, particularly Switzerland, where it is quite a rare surname, France, and Belgium, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in France, the United States, and Switzerland. Very seldom, Demont is the forename as well as the last name.