Udženija 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 (Capljina area) and in Neum, Herzegovina (Neum area). In Svitava in Herzegovina every fifth inhabitant had the family name Udženija.
Prevalence
About 80 people with faimily name Udženija live in Croatia today, in 30 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located and 11 other Croatian places, mostly in Metkovic (15), Dubrovnik (15), Zagreb (10), Mokosica (10), and in Zadar (<10).
Outside Croatia
Family name Udženija (including: Udzenija , Udeniya and Uddeniya ) 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.