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Family name Fust (Fust , Foist , Фуст ) , globally, is quite a rare surname. The surname Fust is habitual in Switzerland, where it is quite a common surname, Germany, where it is quite a rare surname, and Hungary, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Germany, Switzerland, and the United States. Very seldom, Fust is the forename as well as the last name.