Vadlja families are Croats and they are mostly from Prelog area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Cakovec.
Prevalence
About 340 people with faimily name Vadlja live in Croatia today, in 140 households. There were 290 of them in the middle of the past century, and their number increased by 20 percent. They are located in the most of Croatian counties, in 14 cities and 29 other places, mostly in Zagreb (70), Gorican in Cakovec area (65), Cakovec (50), Donji Kraljevec in Prelog area (30), and in Cehovec (15).
Outside Croatia
Family name Vadlja (including: Wadliah , Vadlya and Wadlya ) is present in 10 countries on four 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.