Last name Oijen (Oijen 
) , in the entire world, is quite a rare surname. The cognomen Oijen is characteristic of Malta, where it is quite a rare surname, Netherlands, and Belgium, where it is a rare surname.
| VARIANT | COUNTRY |
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| Oijen | Netherlands, Belgium, Czechia, Poland, Malta |
| leopold alexander theodoor johan frederik van oijen (1856-1918), NL (b. 1856) |
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| cornelis folkert van oijen Dutch university teacher (1885-1962), NL (b. 1885) |
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| j.th.m. smits van oijen (b. 1888) |
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herman willem van oijen |
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| ronald r. van oijen NL (b. 1945) |
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| willem theodoor van oijen (b. 1950) |
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| marion van oijen NL (b. 1960) |
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| merijn van oijen Dutch rower, NL (b. 1973) |
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| jacqueline c f van oijen researcher |
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| martijn g h van oijen researcher (ORCID 0000-0003-4581-1440) |
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| marieke van oijen researcher |
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| martien j. p. van oijen Dutch ichthyologist, NL |
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| martijn g h van oijen researcher (ORCID 0000-0001-7897-1710) |
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| jeroen a. van oijen researcher |
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| antoine m van oijen researcher |
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