Cognomen Iwaszkiewicz (Iwaszkiewicz 
, Ивашкевич 
, Івашкевич ) , globally, is quite a common family name. The cognomen Iwaszkiewicz is characteristic of Eastern Europe, particularly Belarus, where it is quite a common surname, Poland, where it is quite a rare surname, and Ukraine. In absolute terms, it most frequently occurs in Eastern Europe, particularly Belarus, Russia, and Ukraine. Very seldom, Iwaszkiewicz is the forename as well as the last name.
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| Iwaszkiewicz | United Kingdom, Germany, Poland, Italy, United States |
| Ивашкевич | Kazakhstan, Ukraine, Belarus, Kyrgyzstan, Russia |
| Івашкевич, Івашкевіч | Ukraine |
| klemens iwaszkiewicz (b. 1804) |
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| wiktor iwaszkiewicz (b. 1809) |
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edmund iwaszkiewicz officer of the Polish Army, PL (b. 1891) |
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wacław iwaszkiewicz Polish fighter pilot and officer, PL (b. 1893) |
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jarosław iwaszkiewicz Polish poet, essayist, dramatist, and writer (1894-1980), PL (b. 1894) |
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anna iwaszkiewicz Polish writer, PL (b. 1897) |
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maria iwaszkiewicz Polish writer, PL (b. 1924) |
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arnold iwaszkiewicz RU (b. 1915) |
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| janusz iwaszkiewicz Polish historian, PL (b. 1879) |
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| aleksander iwaszkiewicz Officer of the Polish Army, PL (b. 1880) |
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jerzy iwaszkiewicz Polish journalist, PL (b. 1935) |
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| tadeusz iwaszkiewicz (b. 1884) |
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| wacław iwaszkiewicz Polish officer, PL (b. 1894) |
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| bolesław iwaszkiewicz Polish politician, UA (b. 1900) |
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piotr iwaszkiewicz Polish historian, diplomat, PL (b. 1959) |
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