Cognomen Muijen (Muijen 
) , throughout the world, is a rare family name. The last name Muijen is habitual in Netherlands, where it is quite a rare surname, Germany, where it is an extremely rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in Netherlands, Germany, and the United States.
| VARIANT | COUNTRY |
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| Muijen | Netherlands, Germany, United States, United Kingdom |
| cornelis jacobus van muijen NL (b. 1886) |
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| judith ryan-edwards van muijen (b. 1933) |
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| gert-jan van muijen politician, NL (b. 1948) |
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| jaap van muijen Dutch university professor, NL (b. 1960) |
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| dennis van muijen researcher |
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| marloes e van muijen researcher |
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| peter van muijen researcher (ORCID 0000-0001-9939-6858) |
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| a. muijen |
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| lia van muijen NL |
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