Rajko families are Croats and they are mostly from Porec area. The surname Rajko is of origin from Herzegovina. In the past century, relatively most of Croatian residents bearing this family name were born in Pula and in Porec area. In places Rajki and Marasi in Porec area every third inhabitant had the family name Rajko.
Prevalence
About 170 people with faimily name Rajko live in Croatia today, in 70 households. There were 250 of them in the middle of the past century, and their number decreased by 30 percent. They are located in threee Croatian counties, in 11 cities and 20 other places, mostly in Pula (40), Rajki in Porec area (40), Rovinj (15), Kringa in Pazin area (10), and in Porec (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1938 in source Phone Book - Zagreb 1938.