Porobija families are Croats and they are mostly from Sinj area. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj area and in Sinj.
Prevalence
About 100 people with faimily name Porobija live in Croatia today, in 40 households. There were 60 of them in the middle of the past century, and their number increased by 70 percent. They are only located in in 9 Croatian cities and 6 other places, mostly in Split (20), Zagreb (15), Gala in Sinj area (15), Obrovac Sinjski (10), and in Omis (10).
Outside Croatia
Family name Porobija is present in four countries on three continents. The family name "Porobija " 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 few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.