Cognomen Piwowar (Piwowar 
) , all over the world, is quite a rare surname. The last name Piwowar is characteristic of Poland, where it is quite a rare surname, Guatemala, where it is a rare surname, and Austria. In absolute terms, it is the most numerous in Poland, the United States, and Germany. Also, Piwowar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Piwowar | Germany, Guatemala, United States, Poland, France |
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ferdynand piwowar PL (b. 1905) |
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| adam marceli piwowar PL (b. 1874) |
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sławomir piwowar Polish guitarist, keyboardist, composer, arranger, session musician, PL (b. 1953) |
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| stanisław piwowar PL (b. 1920) |
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michael piwowar |
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| jerzy piwowar volleyball player (b. 1946) |
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heather piwowar bioinformatician and open data advocate |
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| piotr piwowar researcher |
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| andrzej piwowar (b. 1970) |
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| agnieszka piwowar Polish pharmacist, researcher, PL |
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| arkadiusz piwowar researcher |
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| monika piwowar Polish molecular biologist and bioinformatician |
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| anna piwowar researcher |
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| joanna piwowar PL (b. 1981) |
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