Surname Petač (Petac 
, Petač 
) , across the world, is a rare cognomen. The last name Petač is habitual in Slovenia, where it is quite a common surname, Romania, where it is a rare surname, and Croatia, where it is a very rare surname. Measured by absolute frequency, the name is most common in Slovenia, Romania, and Philippines.
| VARIANT | COUNTRY |
|---|---|
| Petac | Philippines, Slovenia, Romania, Greece, Spain |
| Petač | Croatia, Slovenia |
| janez petač Yugoslav and Slovenian ice hockey player (1949-2011), SI (b. 1949) |
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| žiga petač Slovene ice hockey player, SI (b. 1980) |
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| peter petač SI |
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| helena petač SI |
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| mihael petač SI |
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| dominik petač SI |
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