Ivanjko families are Croats and they are mostly from Pregrada area. According to some sources the family name originates from Ukrajine. In the past century, relatively most of Croatian residents bearing this family name were born in Pregrada and Zagreb. In Stipernica in Pregrada every third inhabitant had the family name Ivanjko.
Prevalence
About 250 people with faimily name Ivanjko live in Croatia today, in 110 households. There were 200 of them in the middle of the past century, and their number increased by 30 percent. They are located in 9 Croatian counties, in 13 cities and 23 other places, mostly in Zagreb (105), Stipernica (50), Velika Horvatska in Pregrada area (20), Sesvete (10), and in Darda in Osijek area (10).
Outside Croatia
Family name Ivanjko (including: Ivanychko , Ivaniko and Ivanicko ) is present in 10 countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.