Isić families are frequently Bosniaks and they are mostly from Bosnian Krajina , less frequently Croats. In the past century, relatively most of Croatian residents bearing this family name were born in Bosnian Krajina (Teslic area) and in Tuzla Region, Bosnia (Tuzla area). In Gornji Ranković in Bosnian Krajina every sixth inhabitant had the family name Isić.
Prevalence
About 90 people with faimily name Isić live in Croatia today, in 50 households. They are located in the most of Croatian counties, in 14 cities and 25 other places, mostly in Zagreb (20), Rijeka (10), Vir in Nin area (<10), Osijek (<10), and in Sirac in Daruvar area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.