Last name Jasiak (Jasiak 
) , in the entire world, is quite a rare surname. The family name Jasiak is characteristic of Poland, where it is quite a rare surname, Czechia, where it is a rare surname, and France. In absolute terms, it is commonest in Poland, France, and the United States. More frequently, Jasiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jasiak | Germany, France, Czechia, Poland, United States |
| henryk jasiak Polish journalist, PL (b. 1936) |
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| joann jasiak Economist (York University -> Department of Economics) (b. 1963) |
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| aleksandra jasiak researcher (ORCID 0000-0003-0122-1326) |
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| anna jasiak (b. 1980) |
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