Ratkaj families are Croats and they are mostly from Ivanec. In the past century, relatively most of Croatian residents bearing this family name were born in Ivanec and Varazdin. In Vuksani in Ozalj every second inhabitant had the family name Ratkaj.
Prevalence
About 120 people with faimily name Ratkaj live in Croatia today, in 50 households. There were 160 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 8 Croatian counties, in 10 cities and 11 other places, mostly in Karlovac (20), Lepoglava (20), Gacice (20), Zagreb (20), and in Osijek (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1679 in source Catholic Church Parish Records.