Cognomen Leonowicz (Leonowicz 
) , globally, is a rare surname. The surname Leonowicz is habitual in Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and the United States, where it is a very rare surname. In absolute terms, the name is most common in Poland, the United States, and Germany. Also, Leonowicz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Leonowicz | United Kingdom, Germany, Poland, Canada, United States |
| edmund leonowicz Soviet architect, GE (b. 1902) |
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| jan leonowicz PL (b. 1912) |
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| konstanty leonowicz Polish cardiologist, PL (b. 1923) |
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| marcin kazimierz leonowicz researcher, PL (b. 1952) |
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| chuck leonowicz American bobsledder, US (b. 1958) |
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| agnieszka leonowicz Polish association football player, PL (b. 1975) |
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| wojciech leonowicz Polish film actor, PL (b. 1979) |
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| aleksandra leonowicz Polish Righteous Among the Nations, PL |
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| zbigniew leonowicz researcher ORCID ID = 0000-0002-2388-3710 |
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