Cognomen Iwaniec (Iwaniec 
, Иванец 
) , around the world, is quite a rare surname. The last name Iwaniec is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Poland, and Russia. Likewise, Iwaniec is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iwaniec | France, Greece, United Kingdom, Poland, United States |
| Иванец | Belarus, Russia, Kazakhstan, Ukraine |
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henryk iwaniec Polish mathematician, PL (b. 1947) |
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| eugeniusz iwaniec Polish historian, PL (b. 1931) |
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| kazimierz iwaniec Polish politician and deputy (1936-1995), PL (b. 1936) |
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| aleksander iwaniec Polish actor, PL (b. 1940) |
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| tadeusz iwaniec Polish mathematician, PL (b. 1947) |
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| władysław iwaniec Polish engineer, PL (b. 1952) |
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| władysław iwaniec (b. 1942) |
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| władysław iwaniec PL (b. 1942) |
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| halina iwaniec Polish basketball player (1953-), PL (b. 1953) |
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| marek iwaniec Polish speedway rider, PL (b. 1966) |
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| urszula t iwaniec researcher (ORCID 0000-0001-6203-0932) |
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| david m. iwaniec researcher ORCID ID = 0000-0002-0410-4152 |
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| janina iwaniec researcher ORCID ID = 0000-0003-3713-2894 |
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| grégoire iwaniec |
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