In Croatia, Roc families are almost entirely Croats (from Kutina area ), very rarely Czechs (also from Kutina area ). In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Lepoglava.
Prevalence
About 30 people with faimily name Roc live in Croatia today, in 10 households. They are located in threee Croatian counties, threee cities and 5 other places, mostly in Potok in Kutina area (<10), Varazdin (<5), Ivanec (<5), Jerovec (<5), and in Kutina (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1925 in source Emigration Commission Zagreb.