Last name Niewiadomska (Niewiadomska 
) , around the world, is quite a rare surname. The last name Niewiadomska is characteristic of Poland, where it is quite a rare surname, Belgium, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Poland, the United Kingdom, and the United States. More frequently, Niewiadomska is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Niewiadomska | United Kingdom, Poland, Australia, Germany, United States |
| cecylia niewiadomska Polish teacher, translator and publisher (1855-1925), PL (b. 1855) |
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anna niewiadomska Polish diplomat, civil servant, PL (b. 1950) |
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małgorzata niewiadomska-cudak PL (b. 1966) |
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| katarzyna niewiadomska Polish biologist, PL (b. 1929) |
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| barbara niewiadomska (b. 1938) |
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| iwona niewiadomska (b. 1966) |
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| ewa niewiadomska researcher (ORCID 0000-0003-2522-6922) |
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| grażyna niewiadomska researcher, PL |
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| edyta niewiadomska researcher |
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| ewa niewiadomska researcher ORCID ID = 0000-0002-6692-9758, PL |
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| jadwiga niewiadomska Polish Righteous Among the Nations, PL |
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| ewa niewiadomska researcher (ORCID 0000-0003-0612-1949) |
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| magdalena niewiadomska-bugaj Polish mathematician |
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| karolina niewiadomska (b. 1977) |
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| julia niewiadomska Polish handball player |
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