In Croatia, Simonić families are generally Croats (from Banja Luka Region (Bosnia) ), very rarely Slovenes (from Rijeka ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Banja Luka Region, Bosnia (Banja Luka area).
Prevalence
About 40 people with faimily name Simonić live in Croatia today, in 13 households. There were 40 of them in the middle of the past century, and their number remains constant. They are located in 7 Croatian counties, in 7 cities and another small place , mostly in Rijeka (15), Zagreb (<10), Knin (<10), Daruvar (<5), and in Velika Gorica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1691 in source Catholic Church Parish Records.