In Croatia, Zacko families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Slatina area and in Zagreb.
Prevalence
Only a few people with faimily name Zacko live in Croatia today, in three 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 Zagreb (<10).