Surname Jernak (Jernak, Жернак 
) , around the globe, is a rare family name. The last name Jernak is habitual in Belarus, where it is quite a rare surname, Ukraine, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Belarus, Russia, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Жернак | Kazakhstan, Russia, Ukraine, Belarus |