Cognomen Olszewski (Olszewski 
, Ольшевский 
, אולשבסקי 
) , throughout the world, is a common family name. The cognomen Olszewski is habitual in Poland, where it is quite a common surname, Belarus, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Poland, the United States, and Russia. Also, Olszewski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Olszewski | Brazil, Poland, France, United States, Germany |
| Ольшевский | Russia, Ukraine, Kazakhstan, Belarus |
| אולשבסקי | Israel |
| marcin olszewski (b. 1608) |
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| matthias von olszewski 1755 - (b. 1755) |
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| franciszek olszewski (b. 1769) |
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karol stanisław olszewski Polish scientist, PL (b. 1846) |
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| franciszek olszewski (b. 1790) |
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stanisław olszewski Polish engineer and inventor, PL (b. 1852) |
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kajetan olszewski Polish officer (1858-1944), PL (b. 1858) |
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| franciszek olszewski (b. 1805) |
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michał olszewski Polish politician, PL (b. 1868) |
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franciszek olszewski PL (b. 1859) |
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jan gwalbert olszewski Polish artist, PL (b. 1873) |
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bronisław olszewski Polish painter, PL (b. 1874) |
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| heinrich von olszewski DE (b. 1823) |
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| eugen von olszewski DE (b. 1826) |
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| adolf von olszewski DE (b. 1828) |
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