In Croatia, Kukac families are generally Croats (from Labin area ), very rarely Italians (from Porec ). In the past century, relatively most of Croatian residents bearing this family name were born in Labin area and in Porec.
Prevalence
About 20 people with faimily name Kukac live in Croatia today, in 11 households. There were 50 of them in the middle of the past century, and their number decreased significantly. They are only located in threee Croatian cities and threee other places, mostly in Pula (<10), Nova Vas (<10), Rovinj (<5), Topid in Labin area (<5), and in Buici (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.