In Croatia, Mirko families are Croats (from Ploce area ). In the past century, relatively most of Croatian residents bearing this family name were born in Ploce area and in Dubrovnik.
Prevalence
About 60 people with faimily name Mirko live in Croatia today, in 30 households. There were 40 of them in the middle of the past century, and their number increased by 60 percent. They are located in 7 Croatian counties, in 8 cities and 8 other places, mostly in Gradac in Ploce area (25), Zagreb (15), Makarska (<10), and in Trpanj (<10) and Orebic (<5) on the Peljesac peninsula.
Outside Croatia
Family name Mirko (including: Mirco , Myrko ) is present in 46 countries worldwide.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1926 in source Emigration Commission Zagreb.