Cognomen Oleś (Олесь 
, Oleś 
) , all around the world, is quite a rare surname. The surname Oleś is characteristic of Poland, where it is quite a rare surname, Ukraine, where it is a rare surname, and Croatia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Eastern Europe, particularly Poland, Ukraine, and Russia. Likewise, Oleś is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Олесь | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Oleś | Croatia, United States, Poland, United Kingdom |
| andrzej oleś Polish painter (1886-1952), PL (b. 1886) |
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tadeusz oleś Polish zoologist, PL (b. 1940) |
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marcin oleś Polish musician, PL (b. 1973) |
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bartłomiej oleś Polish musician, PL (b. 1973) |
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| marian oleś Polish archbishop (1934-2005), PL (b. 1934) |
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| andrzej michał oleś Polish physicist, PL (b. 1951) |
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| piotr oleś Polish psychologist, PL (b. 1955) |
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| maria oleś Polish psychologist (1956-2017), PL (b. 1956) |
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| wiesław oleś ice hockey player (1974-), PL (b. 1974) |
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| andrzej oleś Polish researcher, PL |
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| małgorzata oleś researcher |
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| piotr oleś researcher, PL |
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| wioleta oleś Polish researcher, PL |
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| krzysztof oleś researcher, PL |
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Jan, Paweł, Piotr, Radek, Rafał, Roman, Dawid, Laura, Jacek, Jarek, Jakub, Julia, Tomek, Filip, Ilona, Iwona, Zofia, Marian, Marcin, Maciej, Monika, Sylwia, Kinga, Kasia, Kamil, Karol, Ewa, Iza, Ola, Alek, Anna, Ania, Adam, Asia, Kaja, Kuba, Szymon, Greg, Igor, Maria, Marta, Marek, Magda, Majka, Aneta, Artur, Agata, Beata, Jola, and Adrian