Cognomen Jankowiak (Jankowiak 
) , around the globe, is quite a common family name. The surname Jankowiak is habitual in Poland, where it is quite a common surname, Germany, where it is quite a rare surname, and France, where it is a rare surname. Not in comparison with a country's population, it is commonest in Poland, Germany, and the United States. Likewise, Jankowiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jankowiak | Poland, France, United States, Germany, Guatemala |
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roman jankowiak PL (b. 1936) |
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| patrick jankowiak French official (b. 1900) |
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wojciech jankowiak PL (b. 1947) |
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| ludwik jankowiak Polish economist, PL (b. 1912) |
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| józef jankowiak PL (b. 1904) |
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| roman jankowiak PL (b. 1914) |
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| stanisław jankowiak Polish canoeist, PL (b. 1941) |
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| günter jankowiak German actor, DE (b. 1951) |
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| janusz jankowiak Polish economist, PL (b. 1957) |
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| stanisław jankowiak Polish historian, PL (b. 1958) |
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| william r. jankowiak (b. 1956) |
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| françois jankowiak French legal historian, FR (b. 1966) |
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| wojciech jankowiak PL (b. 1956) |
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| mirosław jankowiak Polish linguist, PL (b. 1979) |
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| katarzyna jankowiak Polish researcher, PL |
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