Oleynik
Oleynik, also Oleinik ({{langx|ru|Олейник}}) is a Russian-language occupational surname: the word {{lang|ru|олей}} (archaic in Russian, variously spelled in other Slavic languages) means vegetable oil, and 'oleynik' is a person who manufactures or sells oil.Boris Unbegaun, Русские фамилии, [https://archive.org/details/russiansurnames/page/n17/mode/2up p. 19] Notable people with the surname include:
- Aleksandr Oleinik, Russian footballer
- Aleksei Oleinik (born 1977), Russian mixed martial artist and combat sambo fighter
- Alexander Oleinik (kickboxer), Ukrainian kickboxer
- Anatoly Oleynik, Russian professor of chemistry
- Larisa Oleynik (born 1981), American actress
- Olga Arsenievna Oleinik (1925–2001), Soviet mathematician
- Frank Oleynick (born 1955), American retired basketball player