Gilja 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 (Siroki Brijeg area) and in Zagreb.
Prevalence
About 140 people with faimily name Gilja live in Croatia today, in 40 households. They are located in 7 Croatian counties, in 12 cities and 8 other places, mostly in Zagreb (80), Nustar in Vinkovci area (25), Sesvete (15), Velika Gorica (<10), and in Dubrovnik (<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.