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 |
|---|---|
| Janczewski | Poland, France, United States, Germany, Czechia |
| Янчевский | Kazakhstan, Belarus, Ukraine, Russia |
|
edward janczewski-glinka Polish botanist (1846-1918), PL (b. 1846) |
|
|
|
wiktor janczewski Polish lawyer (b. 1858) |
|
| stefan mikołaj janczewski PL (b. 1872) |
|
|
| edward walery janczewski Polish geologist, PL (b. 1887) |
|
|
| kazimierz janczewski LT (b. 1878) |
|
|
| stanisław janczewski (b. 1888) |
|
|
| henryk janczewski (b. 1905) |
|
|
| simon janczewski French association football player and association football manager, FR (b. 1926) |
|
|
| jan janczewski Polish cinematographer (1928-2007), PL (b. 1928) |
|
|
| grzegorz janczewski PL (b. 1935) |
|
|
| józef janczewski (b. 1942) |
|
|
| dariusz janczewski Polish athletics competitor, PL (b. 1958) |
|
|
| zbigniew janczewski Polish Catholic clergyman, PL (b. 1960) |
|
|
| jarosław janczewski PL (b. 1966) |
|
|
| colleen e janczewski researcher (ORCID 0000-0003-0724-7332) |
|