In Croatia, Kotrulja families are generally Croats (from Dugi (Long) Island ), very rarely Slovenes (from Zadar ). In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and Zagreb.
Prevalence
About 30 people with faimily name Kotrulja live in Croatia today, in 12 households. There were 20 of them in the middle of the past century, and their number increased by 30 percent. They are located in threee Croatian counties, threee cities and four other places, mostly in Zadar (10), Zagreb (<10), Savar on Dugi (Long) Island (<10), Split (<5), and in Petrcane (<5).