Cognomen Kleniewski (Kleniewski 
) , across the world, is a rare family name. The cognomen Kleniewski is characteristic of Poland, where it is a rare surname, Canada, where it is a very rare surname, and Norway. In absolute terms, it is the most numerous in Poland, the United States, and Canada. Likewise, Kleniewski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kleniewski | Canada, France, Poland, United Kingdom, United States |
| franciszek kleniewski (b. 1812) |
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| jan kleniewski (b. 1845) |
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| witold kleniewski (b. 1880) |
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| alfred kleniewski PL (b. 1918) |
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| andré kleniewski (b. 1929) |
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| nancy kleniewski American sociologist and academic administrator, US (b. 1950) |
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