Kalac families are Croats and they are mostly from Zadar area. In the past century, relatively most of Croatian residents bearing this family name were born in Zadar area and in Zadar. In Slivnica in Zadar area every eighth inhabitant had the family name Kalac.
Prevalence
About 490 people with faimily name Kalac live in Croatia today, in 170 households. There were 280 of them in the middle of the past century, and their number increased by 70 percent. They are located in the most of Croatian counties, in 21 cities and 36 other places, mostly in Slivnica (75) and Vinjerac (60) in Zadar area, Rijeka (55), Pula (35), and in Zadar (30).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.