Around the globe, Petkus (Petkus 
, Пяткус 
) is a very rare predominantly masculine, but very infrequently feminine given name. The first name Petkus is habitual in Northern Europe, particularly Lithuania, where it is a rare masculine name. Predominantly, Petkus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Petkus | Canada, Latvia, Lithuania, United States, Argentina |
| Пяткус | Russia, Ukraine |