Klak families are Croats and they are mostly from Ivanic-Grad. In the past century, relatively most of Croatian residents bearing this family name were born in Ivanic-Grad and in Zagreb. In Lijevi Dubrovčak in Ivanic-Grad every tenth inhabitant had the family name Klak.
Prevalence
About 60 people with faimily name Klak live in Croatia today, in 20 households. There were 110 of them in the middle of the past century, and their number halved. They are only located in in 6 Croatian cities and 7 other places, mostly in Lijevi Dubrovcak (25), Zagreb (15), Ivanic-Grad (<10), Petrijevci in Valpovo area (<5), and in Prepolno (<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.