Family name Janczewski (Janczewski 
, Янчевский 
) , throughout the world, is quite a rare cognomen. The last name Janczewski is habitual in Belarus, where it is quite a rare surname, Poland, and Lithuania, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Eastern Europe, particularly Poland, Russia, and Belarus. Likewise, Janczewski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janczewski | Czechia, Poland, France, United States, Germany |
| Янчевский | Belarus, Kazakhstan, Russia, Ukraine |
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edward janczewski-glinka Polish botanist (1846-1918), PL (b. 1846) |
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wiktor janczewski Polish lawyer (b. 1858) |
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| stefan mikołaj janczewski PL (b. 1872) |
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| edward walery janczewski Polish geologist, PL (b. 1887) |
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| kazimierz janczewski LT (b. 1878) |
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| stanisław janczewski (b. 1888) |
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| henryk janczewski (b. 1905) |
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| simon janczewski French association football player and association football manager, FR (b. 1926) |
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| jan janczewski Polish cinematographer (1928-2007), PL (b. 1928) |
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| grzegorz janczewski PL (b. 1935) |
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| józef janczewski (b. 1942) |
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| dariusz janczewski Polish athletics competitor, PL (b. 1958) |
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| zbigniew janczewski Polish Catholic clergyman, PL (b. 1960) |
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| jarosław janczewski PL (b. 1966) |
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| colleen e janczewski researcher (ORCID 0000-0003-0724-7332) |
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