Jerončić families are Croats and they are mostly from Omis. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Omis. In Seoca in Omis every second inhabitant had the family name Jerončić.
Prevalence
About 280 people with faimily name Jerončić live in Croatia today, in 110 households. There were 70 of them in the middle of the past century, and their number multiplied. They are located in 6 Croatian counties, in 10 cities and 13 other places, mostly in Split (115), Seoca (65), Omis (35), Rijeka (10), and in Podstrana in Solin area (10).
Outside Croatia
Family name Jerončić (including: Jeroncic , Ieroncich ) is present in 13 countries worldwide.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.