Cognomen Leszczynski (Leszczynski 
, Leszczyński 
, Лещинский 
) , worldwide, is a common family name. The family name Leszczynski is habitual in Poland, where it is quite a common surname, Belarus, and Israel, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Poland, Russia, and Belarus. Likewise, Leszczynski is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Leszczynski | United States, France, Poland, Germany, Israel |
| Leszczyński | United Kingdom, United States, France, Poland, Germany |
| Лещинский | Ukraine, Kazakhstan, Russia, Belarus, Kyrgyzstan |
| Лещинський | Ukraine |
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stanislas leszczynski King of Poland and Grand Duke of Lithuania, FR (b. 1677) |
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paul von leszczynski German officer, PL (b. 1830) |
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| antoni leszczynski (b. 1780) |
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| stanislaus von leszczynski PL (b. 1842) |
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| norbert leszczynski Luxembourgish association football player (1943-2017), LU (b. 1943) |
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| radomír leszczynski Czech graphic, CZ (b. 1945) |
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| jerzy leszczynski (b. 1949) |
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| christoph leszczynski PL (b. 1953) |
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| marcin leszczynski researcher ORCID ID = 0000-0003-3172-4661 |
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| m. leszczynski researcher |
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| tom leszczynski college basketball player (2006–2006) Lafayette |
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| juliusz leszczynski researcher |
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| jerzy leszczynski researcher (ORCID 0000-0001-5290-6136) |
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| agnieszka leszczynski researcher |
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| jerzy leszczynski |
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