Cognomen Petkus (Petkus 
, Пяткус 
) , around the globe, is quite a rare family name. The cognomen Petkus is habitual in Northern Europe, particularly Lithuania, where it is quite a common surname, Latvia, where it is quite a rare surname, and Ireland, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Lithuania, the United States, and Latvia.
| VARIANT | COUNTRY |
|---|---|
| Petkus | Canada, United States, Latvia, Lithuania, Argentina |
| Пяткус | Ukraine, Russia |
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viktoras petkus Lithuanian human rights activist, LT (b. 1928) |
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| stasys petkus LT (b. 1961) |
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| andrius petkus Lithuanian sculptor (b. 1976) |
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| almantas petkus Lithuanian politician, LT (b. 1976) |
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| andrew j petkus researcher (ORCID 0000-0002-7770-0123) |
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| vytautas petkus researcher |
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| justin m petkus researcher (ORCID 0000-0002-3179-1904) |
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| freddy petkus college basketball player (2002–2006) Maine |
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| andré petkus |
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| edvinas petkus Lithuanian footballer, LT (b. 1991) |
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