Jadan families are Croats and they are mostly from Lepoglava area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Lepoglava area.
Prevalence
About 90 people with faimily name Jadan live in Croatia today, in 40 households. There were 140 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 8 Croatian counties, in 8 cities and 14 other places, mostly in Bedekovcina in Lepoglava area (35), Zabok (15), Bjelovar (<10), Donja Dubrava in Koprivnica area (<10), and in Koprivnica (<10).
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.