In Croatia, Modronja families are predominantly Croats (from Glina ), rarely Bosniaks (from Bosnian Krajina ). In the past century, relatively most of Croatian residents bearing this family name were born in Glina and in Bosnian Krajina (Prijedor area). In Joševica in Glina every ninth inhabitant had the family name Modronja.
Prevalence
About 40 people with faimily name Modronja live in Croatia today, in 19 households. There were 30 of them in the middle of the past century, and their number increased by 40 percent. They are only located in in 7 Croatian cities and threee other places, mostly in Glina (10), Zagreb (<10), Pula (<10), Jalsevec Nartski in Dugo Selo area (<10), and in Josevica (<5).
Outside Croatia
Family name Modronja is present in four countries on two continents. The family name "Modronja " is used by small number of people in the United States.
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.