Cognomen Janzen (Janzen 
, Янцен 
, Янзен ) , in all the world, is a common last name. The last name Janzen is habitual in Curacao, where it is quite a common surname, Canada, and Germany. Measured by absolute frequency, this name is the most popular in Germany, Canada, and the United States. Very seldom, Janzen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janzen | Germany, Paraguay, Canada, Brazil, United States |
| Янцен | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| Янзен | Kazakhstan, Ukraine |
| peter janzen (b. 1750) |
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henry l. janzen Canadian politician (1845–1927), CA (b. 1845) |
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| jacob f. janzen (b. 1840) |
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| peter janzen botanist (1851-1922), DE (b. 1851) |
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| susanna baerg janzen (b. 1842) |
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herman diederik janzen Dutch sculptor, NL (b. 1923) |
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horst janzen German painter (1930-1978), DE (b. 1930) |
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| johannes janzen German flying ace, DE (b. 1886) |
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d.h.janzen American biologist, US (b. 1939) |
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| hans janzen (b. 1885) |
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| henry h. janzen German missionary and writer, UA (b. 1901) |
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| jetze willem janzen NL (b. 1891) |
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| wladimir janzen (b. 1900) |
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| rudolf janzen DE (b. 1907) |
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| eldon a. janzen American band director and educator, US (b. 1928) |
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