Opat families are Croats and they are mostly from Orahovica. In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Orahovica. In Vukoder in Karlovac every third inhabitant had the family name Opat.
Prevalence
About 90 people with faimily name Opat live in Croatia today, in 40 households. There were 140 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 9 Croatian counties, in 11 cities and 11 other places, mostly in Karlovac (15), Vukoder (15), Nova Josava (10), Zagreb (<10), and in Ladislav in Garesnica area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.