Cognomen Домальчук-Йонассон (Домальчук-Йонассон 
) , in the entire world, is an extremely rare last name. The last name Домальчук-Йонассон is characteristic of Eastern Europe, particularly Ukraine, where it is an extremely rare surname. Parts of the name also exists independently as a last name Домальчук, and a last name Йонассон.
| VARIANT | COUNTRY |
|---|---|
| Домальчук-Йонассон | Ukraine |