Surname Jonaš (Йонаш 
, Jonaš 
) , throughout the world, is a rare cognomen. The last name Jonaš is characteristic of Ukraine, where it is quite a rare surname, Serbia, where it is a rare surname, and Croatia. Much less frequently, Jonaš is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Йонаш | Belarus, Russia, Ukraine |
| Jonaš | Serbia, Croatia |
| ivan jonaš actor (b. 1922) |
|