Cognomen Iwanowicz (Iwanowicz 
) , globally, is quite a rare last name. The cognomen Iwanowicz is characteristic of Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and Norway. Measured by absolute frequency, it is the most numerous in Poland, the United States, and Germany. More prevalently, Iwanowicz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iwanowicz | United Kingdom, Germany, Poland, United States, Ireland |
| stanisław iwanowicz PL (b. 1900) |
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| deborah iwanowicz researcher ORCID ID = 0000-0002-9613-8594 |
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| joanna iwanowicz (b. 1985) |
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| luke r. iwanowicz researcher |
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