Cognomen Iwaniuk (Iwaniuk 
) , all around the world, is quite a rare surname. The cognomen Iwaniuk is habitual in Poland, where it is quite a rare surname, Switzerland, where it is a rare surname, and Canada. In absolute terms, it is commonest in Poland, the United States, and Germany. More frequently, Iwaniuk is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iwaniuk | Germany, Switzerland, Canada, United States, Poland |
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wacław iwaniuk Poet and literary critic (1912-2001), PL (b. 1912) |
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| mikołaj iwaniuk Polish Righteous Among the Nations, PL (b. 1887) |
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krzysztof iwaniuk PL (b. 1959) |
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| danuta iwaniuk Polish Righteous Among the Nations, PL (b. 1932) |
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| jan iwaniuk (b. 1943) |
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| andrew n. iwaniuk biologist, CA (b. 1974) |
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| andrew n iwaniuk researcher |
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| piotr iwaniuk researcher |
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| andrzej iwaniuk Polish Righteous Among the Nations, PL |
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| agnieszka iwaniuk researcher (ORCID 0000-0001-6499-4989), PL |
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| rafał iwaniuk actor, PL (b. 1982) |
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