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Family name Roosen (روسن , Roosen , Розен ) , worldwide, is quite a common cognomen. The family name Roosen is characteristic of Belgium, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Estonia. Measured by absolute frequency, it is the most numerous in Western Europe, particularly Belgium, Germany, and Netherlands. Very seldom, Roosen is the forename as well as the last name.