Kasumović families are frequently Croats and they are mostly from Gospic area , less frequently Bosniaks (iz Tuzla Region, Bosnia). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Gospic area. In places Klenovac and Mezinovac in Gospic area every fifth inhabitant had the family name Kasumović.
Prevalence
About 330 people with faimily name Kasumović live in Croatia today, in 150 households. There were 260 of them in the middle of the past century, and their number increased by 30 percent. They are located in almost all Croatian counties, in 29 cities and 36 other places, mostly in Zagreb (100), Rijeka (25), Kvarte in Gospic area (20), Novska (20), and in Osijek (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.