In Croatia, Kusulja families are Croats (from Djakovo area ). In the past century, relatively most of Croatian residents bearing this family name were born in Djakovo area and in Djakovo.
Prevalence
About 40 people with faimily name Kusulja live in Croatia today, in 12 households. There were 30 of them in the middle of the past century, and their number increased by 10 percent. They are located in four Croatian counties, two cities and four other places, mostly in Zagreb (15), in Satnica Djakovacka (10) and Drenje (<10) in Djakovo area, Korenica in Otocac area (<5), and in Vukovina (<5).
Outside Croatia
Family name Kusulja (including: Kusulia , Kushulia , Kusulya and Kushulya ) is present in 7 countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.