In Croatia, Gmajner families are generally Croats (from Zabok area ), very rarely Slovenes (also from Zabok area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Klanjec.
Prevalence
About 10 people with faimily name Gmajner live in Croatia today, in five households only. There were 50 of them in the middle of the past century, and their number decreased significantly. They are located in only four Croatian places: in Zagreb (<10), Movrac in Zabok area (<5), Strmec in Samobor area (<5), and in Strmec Sutlanski in Zabok area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.