In Croatia, Gašo families are almost entirely Croats (from Nasice area ), barely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Nasice area and in Doboj, Bosnia (Doboj area).
Prevalence
About 60 people with faimily name Gašo live in Croatia today, in 20 households. There were 40 of them in the middle of the past century, and their number increased by 50 percent. They are only located in in 8 Croatian cities and 6 other places, mostly in Osijek (25), Zagreb (<10), Cernik in Rijeka area (<10), Sisak (<5), and in Kutina (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.