Ferdelja families are Croats and they are mostly from Zabok. In the past century, relatively most of Croatian residents bearing this family name were born in Zabok and Zagreb. In Dubrava Zabočka in Zabok every ninth inhabitant had the family name Ferdelja.
Prevalence
About 70 people with faimily name Ferdelja live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number decreased by 10 percent. They are located in four Croatian counties, in 6 cities and 12 other places, mostly in Dubrava Zabocka (20), Bedekovcina in Lepoglava area (10), Zagreb (<10), Spickovina (<10), and in Novoselec in Ivanic-Grad area (<5).
Outside Croatia
Family name Ferdelja is present in two 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.