Surname Jennissen (Jennissen 
) , all around the world, is a rare last name. The cognomen Jennissen is habitual in Western Europe, particularly Netherlands, where it is quite a rare surname, Germany, where it is a rare surname, and Belgium. Not in comparison with a country's population, the name is most common in Germany, Netherlands, and the United States.
| VARIANT | COUNTRY |
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| Jennissen | Netherlands, Canada, Belgium, United States, Germany |
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émile jennissen Belgian politician and lawyer (1882-1949), BE (b. 1882) |
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| johannes antonius hubertus jennissen Dutch teacher and politician (1848-1934), NL (b. 1848) |
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| gerard jennissen Canadian politician, CA (b. 1942) |
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| theo jennissen Dutch photographer, NL (b. 1955) |
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| charles jennissen researcher |
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| jacob jennissen college basketball player (2020–202_) Colorado State |
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| simone jennissen researcher (ORCID 0000-0002-9219-3641) |
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