Family name Петрокас (Петрокас 
) , all over the world, is a very rare cognomen. The family name Петрокас is characteristic of Belarus, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Russia. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Russia, Belarus, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Петрокас | Belarus, Ukraine, Russia, Kazakhstan |