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Family name Rossum (روسم
, رسوم
, Rossum
) , worldwide, is quite a common last name. The surname Rossum is characteristic of Western Europe, particularly Netherlands, where it is quite a common surname, Belgium, where it is quite a rare surname, and Switzerland. In absolute terms, it most frequently occurs in Netherlands, Belgium, and the United States. Very seldom, Rossum is the forename as well as the last name.