In Croatia, Kolacio families are predominantly Croats (from Rijeka ), rarely Italians (also from Rijeka ), and very rarely Montenegrins (again from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and on the Island of Cres.
Prevalence
About 30 people with faimily name Kolacio live in Croatia today, in 13 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in four Croatian counties, in 6 cities and threee other places, mostly in Rijeka (15), Kastav (<5), Marinici in Rijeka area (<5), Zagreb (<5), and in Orahovica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.