Surname Petrak (Petrak 
, Петрак 
, Petsrak ) , all around the world, is quite a rare family name. The cognomen Petrak is characteristic of Croatia, where it is quite a common surname, Czechia, and Slovakia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Czechia, Croatia, and the United States. Very seldom, Petrak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Petrak | United States, Thailand, Croatia, Czechia, Germany |
| Петрак | Ukraine, Russia, Kazakhstan |
| Petsrak | Thailand |
| Petrák | United States, Czechia, Slovakia, Hungary |
| ulrich petrak Austrian author, AT (b. 1753) |
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| franz petrak Austrian-Czech botanist and mycologist (1886–1973), AT (b. 1886) |
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| josef petrak Austrian composer, AT (b. 1908) |
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| franjo petrak Yugoslav footballer (b. 1911) |
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| rudolf petrak Czech-born operatic tenor singer, SK (b. 1917) |
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| nikica petrak (b. 1939) |
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| rainer petrak DE (b. 1940) |
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| michael petrak German author, DE (b. 1956) |
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| andreas petrak (b. 1961) |
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| karel petrak researcher |
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| benjamin petrak researcher |
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| jelka petrak researcher |
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| ondrej petrak researcher ORCID ID = 0000-0001-8992-3562 |
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| bryan petrak Ph.D. University of Delaware 2012 |
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| frank petrak researcher |
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