Cognomen Januszkiewicz (Januszkiewicz 
, Янушкевич 
) , around the globe, is quite a common surname. The last name Januszkiewicz is habitual in Eastern Europe, particularly Belarus, where it is quite a common surname, Poland, where it is quite a rare surname, and Ukraine. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Belarus, Poland, and Russia. Also, Januszkiewicz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Januszkiewicz | Canada, United Kingdom, United States, Germany, Poland |
| Янушкевич | Kyrgyzstan, Kazakhstan, Belarus, Ukraine, Russia |
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eustachy januszkiewicz PL (b. 1805) |
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romuald januszkiewicz FR (b. 1808) |
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| albin kazimierz januszkiewicz (b. 1806) |
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aleksander januszkiewicz UA (b. 1872) |
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roman januszkiewicz PL (b. 1873) |
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stanisław januszkiewicz Polish physician, radiologist (1903-1979), PL (b. 1903) |
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| hans von januszkiewicz writer (1855-1937), PL (b. 1855) |
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henryk januszkiewicz officer of the Polish Army, PL (b. 1917) |
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| żelisław januszkiewicz (b. 1897) |
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marcin januszkiewicz Polish actor, PL (b. 1987) |
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| włodzimierz januszkiewicz PL (b. 1944) |
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| barbara januszkiewicz artist, US (b. 1955) |
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| zbigniew januszkiewicz Polish sportsperson, PL (b. 1962) |
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| łukasz januszkiewicz researcher ORCID ID = 0000-0002-6286-4651, PL |
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| krystyna januszkiewicz Polish architect, PL |
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