Surname Oudejans (Oudejans 
) , in all the world, is quite a rare cognomen. The surname Oudejans is characteristic of Netherlands, where it is quite a rare surname, Austria, where it is a rare surname, and Hungary. In absolute terms, it most frequently occurs in Netherlands, Poland, and Austria.
| VARIANT | COUNTRY |
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| Oudejans | Netherlands, South Africa, Poland, Austria, Australia |
| wilhelmus oudejans NL (b. 1877) |
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h.th. oudejans NL (b. 1928) |
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| gijsbertha oudejans NL (b. 1883) |
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| robertus cornelis hilarius maria oudejans botanist, NL (b. 1943) |
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| joost oudejans researcher |
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| cees b m oudejans researcher |
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| oudejans paper artist |
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| raôul r d oudejans researcher |
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| jacobus oudejans NL |
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| adriana oudejans NL |
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| machiel g. oudejans |
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| markus oudejans |
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| tessa oudejans Association footballer, NL (b. 1991) |
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