Cognomen Siwiec (Siwiec 
, Сивец 
, Сівець ) , globally, is quite a common family name. The surname Siwiec is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Belarus, and Ukraine, where it is a rare surname. In absolute terms, it is commonest in Eastern Europe, particularly Poland, Belarus, and Russia. Also, Siwiec is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siwiec | Germany, United States, Poland, Canada, France |
| Сивец | Kazakhstan, Russia, Ukraine, Belarus |
| Сівець | Ukraine |
| jan siwiec politician, PL (b. 1829) |
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kunegunda siwiec PL (b. 1876) |
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| stefan siwiec PL (b. 1863) |
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| jeanette siwiec holocaust victim, b. 1874-12-28, AT (b. 1874) |
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| bolesław siwiec Officer of the Polish Army, GB (b. 1893) |
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| jan siwiec PL (b. 1891) |
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marek siwiec Polish politician, PL (b. 1955) |
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| ryszard siwiec Polish patriot, PL (b. 1909) |
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bartłomiej siwiec Polish chess player and journalist, PL (b. 1975) |
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| janina siwiec PL (b. 1917) |
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natalia siwiec Polish glamour model and pop singer, PL (b. 1983) |
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| irena siwiec PL (b. 1929) |
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| tadeusz siwiec PL (b. 1950) |
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| marek siwiec (b. 1950) |
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| marek siwiec Polish politician and deputy, PL (b. 1964) |
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