Cognomen Gregorac (Gregorac 
) , worldwide, is a very rare surname. The cognomen Gregorac is characteristic of Croatia, where it is a rare surname, Germany, where it is an extremely rare surname, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Gregorac | United States, Croatia, Germany |
| robert john gregorac Ph.D. University of Iowa 1965 |
|