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Surname Oosterum (Oosterum
) , across the world, is a rare cognomen. The surname Oosterum is habitual in Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and Australia, where it is a very rare surname. In absolute terms, the name is most common in Western Europe, particularly Netherlands, Belgium, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Oosterum | Netherlands, Belgium, Australia, United Kingdom, Germany |