Family name Iwaszko (Iwaszko 
) , globally, is a rare cognomen. The last name Iwaszko is characteristic of Poland, where it is quite a rare surname, Australia, where it is a rare surname, and New Zealand. In absolute terms, it most frequently occurs in Poland, the United States, and France. Likewise, Iwaszko is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iwaszko | Australia, France, United States, United Kingdom, Poland |
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ludwik iwaszko officer of the Polish Army, PL (b. 1894) |
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| jan iwaszko Polish officer (1921-2015), PL (b. 1921) |
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| tadeusz iwaszko Polish historian, PL (b. 1935) |
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| iwaszko aleksandrowicz sołtan civil servant |
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| józef iwaszko researcher ORCID ID = 0000-0002-5660-9531, PL |
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| iwaszko daszkiewicz |
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| iwaszko władyka |
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| iwaszko niemirycz |
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| iwaszko goyczowicz |
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