Grgas families are Croats and they are mostly from Jastrebarsko area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Benkovac. In Hutin in Jastrebarsko area every fifth inhabitant had the family name Grgas.
Prevalence
About 290 people with faimily name Grgas live in Croatia today, in 130 households. There were 230 of them in the middle of the past century, and their number increased by 20 percent. They are located in the most of Croatian counties, in 19 cities and 21 other places, mostly in Sibenik (45), Zagreb (45), Split (25), Zapresic (25), and in Jastrebarsko (20).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1923 in source Emigration Commission Zagreb.