In Croatia, Rock families are Croats (from Zupanja ). In the past century, relatively most of Croatian residents bearing this family name were born in Zupanja area and in Varazdin.
Prevalence
Only a few people with faimily name Rock live in Croatia today, in three households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only threee naselja i to in Zupanja (<5), Varazdin (<5), and in Zabnik in Varazdin area (<5).
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.