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.
| VARIANT | COUNTRY |
|---|---|
| Olšák | Czechia |
| jaroslav olšák CZ (b. 1914) |
|
|
|
eliška olšáková CZ (b. 1968) |
|
| slavomil olšák CZ (b. 1923) |
|
|
| michal olšák CZ (b. 1978) |
|