Surname Sienkiewicz (Sienkiewicz 
, Сенкевич 
, סנקביץ' 
) , around the globe, is a common family name. The cognomen Sienkiewicz is habitual in Eastern Europe, particularly Poland, where it is quite a common surname, Belarus, and Russia, where it is quite a rare surname. In absolute terms, the name is most common in Poland, Russia, and the United States. Also, Sienkiewicz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sienkiewicz | United Kingdom, United States, Afghanistan, Poland, Germany |
| Сенкевич | Ukraine, Kazakhstan, Lithuania, Russia, Belarus |
| סנקביץ' | Israel |
| antoni marcin sienkiewicz PL (b. 1690) |
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henryk sienkiewicz Polish writer, novelist, journalist, philanthropist and Nobel Prize laureate, PL (b. 1846) |
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henryk sienkiewicz (b. 1852) |
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| joseph adam sienkiewicz French diplomat (1836–1898), FR (b. 1836) |
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| robert sienkiewicz (b. 1826) |
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| władysław artur sienkiewicz PL (b. 1834) |
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jerzy sienkiewicz Polish art historian, museologist, PL (b. 1897) |
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anatol sienkiewicz Veterinarian, officer of the Polish Army, DE (b. 1905) |
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witold sienkiewicz (b. 1920) |
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henryk sienkiewicz Polish politician, mining engineer, Member of Parliament (1931-2012), PL (b. 1931) |
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krystyna sienkiewicz Polish actress (1935-2017), PL (b. 1935) |
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| casimir sienkiewicz American artist and banker, US (b. 1889) |
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bohdan sienkiewicz PL (b. 1931) |
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| henryk józef sienkiewicz (b. 1882) |
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| stanisław sienkiewicz Lieutenant colonel of the Polish Army, PL (b. 1895) |
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