In Croatia, Gregorac families are generally Croats (from Ozalj ), very rarely Slovenes, and . In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Ozalj.
Prevalence
About 30 people with faimily name Gregorac live in Croatia today, in 12 households. There were 20 of them in the middle of the past century, and their number increased by 30 percent. They are located in four Croatian counties, threee cities and 8 other places, mostly in Darda in Osijek area (<10), Vivodina (<10), Brezik in Virovitica area (<5), Zagreb (<5), and in Lovic Prekriski (<5).
Outside Croatia
Family name Gregorac is present in 8 countries on three continents. The family name "Gregorac " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.