Cognomen Olšák (Olšák 
) , in the world, is a rare family name. The last name Olšák is habitual in Eastern Europe, particularly Czechia, where it is quite a rare surname.
| jaroslav olšák CZ (b. 1914) |
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eliška olšáková CZ (b. 1968) |
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| slavomil olšák CZ (b. 1923) |
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| michal olšák CZ (b. 1978) |
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