Last name Ивацко (Ивацко 
, Ivacko 
) , all over the world, is a very rare cognomen. The surname Ивацко is habitual in Croatia, where it is a very rare surname, Russia, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ивацко | Russia |
| Ivacko | Canada, United States, Croatia |