In Croatia, Cvrtko families are Croats (from Vrbovec ). In the past century, relatively most of Croatian residents bearing this family name were born in Krizevci.
Prevalence
Only a few people with faimily name Cvrtko live in Croatia today, in two households only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are located in one Croatian city only, in Vrbovec (<5).
Outside Croatia
Family name Cvrtko is present in 7 countries on three continents.