In Croatia, Vlak families are almost entirely Croats (from Split ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Zagreb.
Prevalence
About 30 people with faimily name Vlak live in Croatia today, in 13 households. There were 90 of them in the middle of the past century, and their number decreased significantly. They are located in four Croatian counties, four cities and another small place , mostly in Split (30), Zagreb (<10), Petrinja (<5), Dugo Selo (<5), and in Grohote on the Island of Solta (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1672 in source Catholic Church Parish Records.