In Croatia, Gerza families are Croats (from Koprivnica ). In the past century, relatively most of Croatian residents bearing this family name were born in Koprivnica.
Prevalence
Only a few people with faimily name Gerza live in Croatia today, in two households only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Koprivnica (<5) and Veliki Otok in Koprivnica area (<5).
Outside Croatia
Family name Gerza is present in 7 countries on three continents. The family name "Gerza " 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 1942 in source Phone Directory of the Independent State of Croatia 1942.