Surname Lesiak (Lesiak 
, Лесяк 
) , worldwide, is quite a rare cognomen. The last name Lesiak is habitual in Poland, where it is quite a rare surname, Austria, and Ireland, where it is a rare surname. In absolute terms, it is the most numerous in Poland, the United States, and Austria. Likewise, Lesiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lesiak | United Kingdom, Austria, United States, Poland, France |
| Лесяк | Ukraine, Belarus, Russia |
| jan karol lesiak Polish association football player (1913-1946), PL (b. 1913) |
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andrzej lesiak Polish association football player and manager, PL (b. 1966) |
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| władysław lesiak PL (b. 1908) |
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| ivan lesiak Croatian sculptor, RU (b. 1929) |
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| zdzisław lesiak Polish diplomat, PL (b. 1929) |
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| henryk lesiak Polish journalist, PL (b. 1932) |
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| jan lesiak Polish military officer, PL (b. 1945) |
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kacper lesiak Polish diver, PL (b. 1996) |
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| tadeusz lesiak Polish physicist, PL (b. 1962) |
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| maciej lesiak Polish internist and cardiologist, PL (b. 1962) |
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| anna lesiak researcher (ORCID 0000-0003-1396-2690) |
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| adam lesiak researcher |
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| piotr lesiak Polish physicist (Warsaw University of Technology), PL |
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| jan lesiak Ph.D. Uniwersytet Łódzki 1975 |
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| marta lesiak researcher, PL |
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