In Croatia, Roček families are mainly Croats (from Osijek ), equally Czechs (from Daruvar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and Pakrac.
Prevalence
About 30 people with faimily name Roček live in Croatia today, in 11 households. There were 50 of them in the middle of the past century, and their number decreased by 50 percent. They are only located in in 6 Croatian cities and four other places, mostly in Osijek (10), Grubisno Polje (<10), Mali Zdenci (<5), Dubrovnik (<5), and in Krizevci (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.