Surname Masiak (Masiak 
) , globally, is a rare family name. The cognomen Masiak is habitual in Poland, where it is quite a rare surname, Germany, where it is a rare surname, and the United Kingdom, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Poland, the United States, and Germany. Likewise, Masiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Masiak | United Kingdom, Poland, France, Germany, United States |
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franciszek masiak Polish sculptor, PL (b. 1906) |
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| michał masiak Polish pharmaceutical scientist, PL (b. 1924) |
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| anna masiak researcher, PL |
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| jolanta masiak Polish researcher, PL |
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| łukasz masiak Polish journalist, PL (b. 1983) |
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| magdalena masiak PL |
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| kacper masiak Polish footballer, PL |
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