Cognomen Kolacko (Kolacko 
) , in the entire world, is a very rare family name. The family name Kolacko is characteristic of Serbia, where it is a rare surname, Croatia, where it is a very rare surname, and Australia. Not in comparison with a country's population, this name is the most popular in Serbia, Germany, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Kolacko | Serbia, Australia, Croatia, Germany, United States |