Janko families are usually Croats and they are mostly from Porec area , rarely Italians. In the past century, relatively most of Croatian residents bearing this family name were born in Pula and in Porec area. In Orbani in Porec area nearly every inhabitant had the family name Janko.
Prevalence
About 280 people with faimily name Janko live in Croatia today, in 130 households. There were 290 of them in the middle of the past century, and their number remains constant. They are located in 9 Croatian counties, in 19 cities and 25 other places, mostly in Pula (45), Porec (45), Rovinj (30), Zagreb (20), and in Rijeka (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.