Kalaica families are Croats and they are mostly from western Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Livno area) and in Vinkovci.
Prevalence
About 200 people with faimily name Kalaica live in Croatia today, in 70 households. There were 30 of them in the middle of the past century, and their number multiplied. They are located in 9 Croatian counties, in 17 cities and 13 other places, mostly in Vinkovci (50), Nustar in Vinkovci area (40), Samobor (25), Dugo Selo (20), and in Zagreb (15).
Outside Croatia
Family name Kalaica is present in 9 countries on four continents.
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.