In Croatia, Krok families are almost entirely Croats (from Novi Marof area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Rijeka. In Graberanec in Vrbovec every fifth inhabitant had the family name Krok.
Prevalence
About 40 people with faimily name Krok live in Croatia today, in 16 households. There were 70 of them in the middle of the past century, and their number decreased by 50 percent. They are located in threee Croatian counties, two cities and 6 other places, mostly in Zagreb (20), Maretic in Novi Marof area (<10), Podkilavac in Rijeka area (<5), Konjscina in Zlatar area (<5), and in Spickovina (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.