Cognomen Petrák (Petrak 
, Petrák 
, Петрак 
) , in the entire world, is quite a rare surname. The cognomen Petrák is habitual in Croatia, where it is quite a common surname, Czechia, and Slovakia, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Czechia, Croatia, and the United States. Very seldom, Petrák is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Petrak | Germany, Thailand, Czechia, United States, Croatia |
| Petrák | Czechia, United States, Hungary, Slovakia |
| Петрак | Kazakhstan, Russia, Ukraine |
| oldřich petrák CZ (b. 1753) |
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| alois petrák Bohemian artist, CZ (b. 1811) |
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| jan petrák CZ (b. 1837) |
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| eduard rudolf petrák Czechoslovak pedagogue (1855-1931), CZ (b. 1855) |
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| josef petrák CZ (b. 1851) |
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| jan petrák Czech architect, CZ (b. 1874) |
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| josef petrák (b. 1868) |
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| jaroslav petrák technology museum clerk in Prague, expert in photography and journalist, CZ (b. 1882) |
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| antonín petrák CZ (b. 1873) |
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| alois petrák secretary of a trade association in Prague, Czechia (1885-??), CZ (b. 1885) |
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| štěpán petrák CZ (b. 1889) |
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| jan petrák (b. 1889) |
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| anton petrák SK (b. 1912) |
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| václav petrák CZ (b. 1920) |
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| emil petrák CZ (b. 1922) |
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Jan, Martin, Matěj, Monika, Miloš, Michal, Máté, Andrea, Andrej, Klára, Rudolf, Daniel, Luděk, Lumír, Jiřin, Jiří, Nikola, Matyáš, Benedek, Bohumil, Klaudia, Dominik, Filip, Fanni, Vojta, Jirka, Ota, Adam, Petr, Ján, Erik, Zita, Marek, Milan, Aleš, Alois, Lukáš, Boris, Kamil, Pavel, Pavol, Peter, Radim, Radek, David, Jakub, Josef, Jozef, Karel, and Tomáš