In Croatia, Brok families are Croats (from Zadar ). In the past century, relatively most of Croatian residents bearing this family name were born in Zadar.
Prevalence
About 30 people with faimily name Brok live in Croatia today, in 14 households. There were 10 of them in the middle of the past century, and their number tripled. They are located in only threee naselja i to in Zadar (15), Ist (<10), and in Zagreb (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.