Cognomen Błaszak (Błaszak 
) , globally, is a rare surname. The cognomen Błaszak is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname.
| VARIANT | COUNTRY |
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| Błaszak | Poland |
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czesław błaszak Polish zoologist, PL (b. 1942) |
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| maciej błaszak Polish physicist, PL (b. 1953) |
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| eugeniusz błaszak Polish speedway rider, PL (b. 1954) |
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| genowefa błaszak Polish hurdler, PL (b. 1957) |
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| danuta błaszak poet (b. 1961) |
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| magdalena błaszak researcher |
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| marcin błaszak Polish actor, PL (b. 1980) |
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Jan, Bartek, Kacper, Konrad, Patryk, Robert, Renata, Danuta, Damian, Dorota, Dąbrówka, Lucyna, Janusz, Joanna, Tomasz, Halina, Fabian, Oliwia, Wojtek, Martyna, Mateusz, Michał, Adrian, Alicja, Sylwia, Monika, Ewa, Anna, Ania, Adam, Kuba, Eryk, Marta, Artur, Beata, Karol, Andrzej, Kamil, Kinga, Paweł, Piotr, Dawid, Jakub, Jerzy, Jurek, Iwona, Marcin, Maciej, Kasia, and Barbara