Eror families can be both Serbs and Croats (from Otocac ). In the past century, relatively most of Croatian residents bearing this family name were born in Duga Resa area and in Zagreb. In Klokoč in Duga Resa area every eighth inhabitant had the family name Eror.
Prevalence
About 200 people with faimily name Eror live in Croatia today, in 90 households. There were 290 of them in the middle of the past century, and their number decreased by 30 percent. They are located in the most of Croatian counties, in 21 cities and 25 other places, mostly in Zagreb (45), Karlovac (30), Osijek (15), Debelo Brdo in Obrovac area (10), and in Prozor (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1691 in source Catholic Church Parish Records.