Jažo families are Croats and they are mostly from Herzegovina. In the past century, relatively most of Croatian residents bearing this family name were born in Herzegovina (Posusje area) and in Imotsko. In Zagorje in Herzegovina every tenth inhabitant had the family name Jažo.
Prevalence
About 120 people with faimily name Jažo live in Croatia today, in 40 households. They are located in 8 Croatian counties, in 13 cities and 13 other places, mostly in Resetari in Nova Gradiska area (25), Split (15), Dubrovnik (10), Zagreb (<10), and in Predavac in Bjelovar area (<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.