Oreč families are Croats and they are mostly from Bosnian Posavina. According to some sources they are from Posusje in Herzegovina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Derventa area) and in Slavonski Brod.
Prevalence
About 520 people with faimily name Oreč live in Croatia today, in 190 households. There were 20 of them in the middle of the past century, and their number multiplied. They are located in almost all Croatian counties, in 32 cities and 37 other places, mostly in Slavonski Brod (145), Zagreb (115), Podstrana in Solin area (30), Podvinje (25), and in Sesvete (25).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.