Gmajnić families are Croats and they are mostly from Krapina area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Krapina.
Prevalence
About 140 people with faimily name Gmajnić live in Croatia today, in 50 households. There were 130 of them in the middle of the past century, and their number increased by 10 percent. They are located in the most of Croatian counties, in 15 cities and 16 other places, mostly in Zagreb (25), Hromec in Krapina area (20), Josipovac (15), Radoisce (15), and in Sesvete (15).
Outside Croatia
Family name Gmajnić is present in this form only in Croatia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.