In Croatia, Gregor families are generally Croats (from Virovitica area ), very rarely Slovenes (from Zagreb ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Zagreb.
Prevalence
About 30 people with faimily name Gregor live in Croatia today, in 15 households. There were 60 of them in the middle of the past century, and their number halved. They are located in 7 Croatian counties and four other places, mostly in Zagreb (<10), Karlovac (<10), Koprivnica (<10), Recica (<5), and in Cepin in Osijek area (<5).
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.