Kudeljnjak families are Croats and they are mostly from Lepoglava. In the past century, relatively most of Croatian residents bearing this family name were born in Lepoglava and Bjelovar.
Prevalence
About 80 people with faimily name Kudeljnjak live in Croatia today, in 40 households. There were 60 of them in the middle of the past century, and their number increased by 40 percent. They are located in 6 Croatian counties, in 10 cities and 14 other places, mostly in Zagreb (15), Gornja Visnjica (15), Valpovo (<10), Donja Visnjica (<10), and in Krizevci (<10).
Outside Croatia
Family name Kudeljnjak is present in 7 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.