Cognomen Oliynyk (Олейник 
, Oliynyk 
, Олийнык 
, along with others...) , worldwide, is a widespread surname. The surname Oliynyk is habitual in Eastern Europe, particularly Ukraine, where it is a common surname, Belarus, where it is quite a common surname, and Russia (explore the name in all countries). Measured by absolute frequency, the name is most common in Ukraine, Russia, and Kazakhstan.
| VARIANT | COUNTRY |
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| Олейник | Ukraine, Kazakhstan, Russia, Belarus, Kyrgyzstan |
| Oliynyk | Ukraine, United States, Spain, Afghanistan, Italy |
| Олийнык | Ukraine, Romania, Russia, Belarus |
| Олийник | Ukraine, Russia, Kazakhstan |
| Олійник | Ukraine, Poland |
| mykola oliynyk (b. 1921) |
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| todd oliynyk Australian mathematician |
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| anton o oliynyk researcher |
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| oleksandr v oliynyk researcher |
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| gene oliynyk college basketball player (2003–2004) Northeastern |
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| viktor v oliynyk researcher |
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| roman teo oliynyk population geneticist |
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| valeriy oliynyk researcher |
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| iryna oliynyk researcher |
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| oleksiy oliynyk Ukrainian ice dancer, UA (b. 1994) |
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| sergei oliynyk Russian association football player, RU |
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Mr, Inna, Ivan, Igor, Ihor, Olga, Oleg, Oleh, Olya, Olha, Vlad, Yana, Yura, Zoya, Maria, Marta, Misha, Sasha, Shari, Susan, Serge, Yuri, Sofia, Vova, Vira, Kim, Jay, F D, Ira, Ola, Mila, Alex, Alla, Andy, Vera, Anna, Kyle, Roma, Dima, Lena, Luba, John, Juan, Nazz, Nick, Kate, and Sveta