Cognomen Niewiadomski (Niewiadomski 
, Нев'Ядомський 
, Невядомский 
) , worldwide, is quite a common family name. The cognomen Niewiadomski is habitual in Poland, where it is quite a common surname, Belarus, where it is a rare surname, and Ireland. Not in comparison with a country's population, the name is most common in Poland, Germany, and the United States. Also, Niewiadomski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Niewiadomski | United Kingdom, Poland, France, Germany, United States |
| Нев'Ядомський | Ukraine |
| Невядомский | Belarus, Kazakhstan, Russia |
| tymoteusz niewiadomski (b. 1682) |
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| teodat niewiadomski LT (b. 1692) |
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ksawery prus niewiadomski PL (b. 1823) |
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wincenty niewiadomski PL (b. 1826) |
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stanisław niewiadomski Polish composer, music critic and music educator, UA (b. 1859) |
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eligiusz niewiadomski Polish artist and assassin of Gabriel Narutowicz (1869-1923), PL (b. 1869) |
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| gracjan prus niewiadomski PL (b. 1811) |
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stanisław niewiadomski UA (b. 1895) |
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| franciszek niewiadomski Polish lawyer, PL (b. 1860) |
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| stanisław niewiadomski Polish poet, PL (b. 1900) |
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zygmunt niewiadomski Polish jurist, PL (b. 1950) |
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| henryk niewiadomski Polish chemist (1905-1992), PL (b. 1905) |
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henryk niewiadomski PL (b. 1948) |
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| stefan niewiadomski PL (b. 1899) |
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| czesław niewiadomski (b. 1900) |
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