Family name Janowiak (Janowiak 
) , in the entire world, is quite a rare surname. The surname Janowiak is characteristic of Poland, where it is quite a rare surname, Czechia, where it is a rare surname, and the United States. Measured by absolute frequency, the name is most common in the United States, Poland, and Germany. Also, Janowiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janowiak | Germany, Czechia, Poland, United States, China |
| leszek janowiak association football player, PL (b. 1951) |
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| paul janowiak (b. 1951) |
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| piotr janowiak researcher |
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| franciszek janowiak Polish biologist and plant physiologist, PL |
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| maria k. janowiak American climatologist |
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| diane janowiak researcher ORCID ID = 0000-0002-9208-0647 |
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| lyndee janowiak US |
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