Jadek families are Croats and they are mostly from Zabok area. In the past century, relatively most of Croatian residents bearing this family name were born in Zabok and Slatina.
About 80 people with faimily name Jadek live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number increased by 0 percent. They are located in 7 Croatian counties, in 8 cities and 12 other places, mostly in Slatina (20), Zabok (20), Donja Pacetina in Zabok area (<10), Zagreb (<10), and in Vrbovec (<5).