Last name Janiak (Janiak 
) , around the globe, is quite a common cognomen. The surname Janiak is characteristic of Poland, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Germany, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Poland, the United States, and Germany. Also, Janiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janiak | Germany, France, United States, United Kingdom, Poland |
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claude janiak Swiss politician, CH (b. 1948) |
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marek krzysztof janiak Polish radio-biologist, immunologist, epidemiologist, military physician, PL (b. 1950) |
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edward janiak Polish bishop and theologian, PL (b. 1952) |
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marek janiak Polish architect, PL (b. 1955) |
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| len janiak American football player, US (b. 1915) |
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| marian i. janiak (b. 1908) |
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olivier janiak Polish journalist, television presenter, model, PL (b. 1974) |
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| franciszek janiak PL (b. 1919) |
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| kazimierz janiak Polish sportsperson and athletics competitor, PL (b. 1931) |
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kamila janiak Polish poet and singer, PL (b. 1984) |
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| kazimierz janiak PL (b. 1924) |
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| lawrence janiak American, born 1938; artist, US (b. 1938) |
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| janusz janiak cyclist, PL (b. 1938) |
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| larry janiak (b. 1938) |
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| adam janiak Polish computer scientist, PL (b. 1949) |
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