Surname Йонка (Йонка 
, Jonca 
, Jonka 
) , in all the world, is quite a rare last name. The cognomen Йонка is characteristic of Bulgaria, where it is quite a common surname, North Macedonia, where it is quite a rare surname, and Albania. Measured by absolute frequency, it is the most numerous in Bulgaria, Poland, and France. Likewise, Йонка is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Йонка | Ukraine, Bulgaria |
| Jonca | Germany, Romania, United States, Poland, France |
| Jonka | Germany, United States, Poland, France, Albania |
| Ionka | Georgia, United States, Bulgaria, Greece, Venezuela |