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Last name Oostrum (Oostrum ) , globally, is quite a rare family name. The cognomen Oostrum is habitual in Netherlands, where it is quite a rare surname, Estonia, where it is a rare surname, and Belgium, where it is a very rare surname. In absolute terms, this name is the most popular in Western Europe, particularly Netherlands, Germany, and Belgium. Very seldom, Oostrum is the forename as well as the last name.