Cognomen Petrinac (Petrinac 
) , in all the world, is a very rare last name. The cognomen Petrinac is habitual in Croatia, where it is quite a rare surname, Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Petrinac is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Petrinac | Croatia, United States, Canada |