Cognomen Pieniak (Pieniak 
) , all around the world, is quite a rare surname. The family name Pieniak is habitual in Poland, where it is quite a rare surname, Germany, where it is a rare surname, and Romania. Not in comparison with a country's population, it most frequently occurs in Poland, Germany, and Brazil. Also, Pieniak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Pieniak | Germany, Brazil, United States, Poland, Romania |
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franciszek pieniak Captain of the Polish Army (1903-1968), PL (b. 1903) |
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czesław pieniak PL (b. 1918) |
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| stanisław pieniak PL (b. 1932) |
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| andrzej pieniak (b. 1937) |
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| zuzanna pieniak researcher |
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| daniel pieniak researcher (ORCID 0000-0001-7807-3515) |
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| michal pieniak researcher (ORCID 0000-0002-2991-7109) |
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| katarzyna pieniak researcher |
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| dawid pieniak |
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