Cognomen Olejník (Olejník 
) , in all the world, is a rare last name. The last name Olejník is habitual in Slovakia, where it is quite a rare surname, Czechia, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Olejník | Czechia, United States, Slovakia |
| františek olejník Czechoslovak senator of Czechoslovak National Parliament and Czechoslovak politician, CZ (b. 1880) |
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ján olejník SK (b. 1921) |
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| antonín olejník (b. 1902) |
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| josef olejník Czech composer and roman catholic priest, CZ (b. 1914) |
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| štefan olejník SK (b. 1917) |
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| oldřich olejník CZ (b. 1917) |
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| jan olejník Czech musician and composer (b. 1930) |
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| ladislav olejník Czechoslovak ice hockey player, CZ (b. 1932) |
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| stanislav olejník CZ (b. 1934) |
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| jozef olejník Slovak association football player and coach, SK (b. 1946) |
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| marián olejník (b. 1953) |
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| jan olejník CZ (b. 1957) |
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| petr olejník CZ (b. 1962) |
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| martin olejník Czech table tennis player (b. 1972) |
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| marián olejník slalom canoer, SK (b. 1976) |
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Jan, Roland, Daniel, Dušan, Dávid, Jiří, Vašek, Šimon, Marián, Lukáš, Tomáš, Václav, Zdeněk, Štefan, Miroslav, Rastislav, Ladislav, Jaroslav, Miško, Vladimír, Michal, Matúš, Miro, Adam, Aďo, Petr, Ján, Ivan, Marek, Pavel, Peter, Radek, Roman, David, Jakub, Jozef, Juraj, Filip, Martin, Miloš, and František