Gumbas families are Croats and they are mostly from Krapina. In the past century, relatively most of Croatian residents bearing this family name were born in Krapina and Zagreb. In Žutnica in Krapina every seventh inhabitant had the family name Gumbas.
Prevalence
About 120 people with faimily name Gumbas live in Croatia today, in 50 households. There were 70 of them in the middle of the past century, and their number increased by 70 percent. They are located in 6 Croatian counties, in 8 cities and 11 other places, mostly in Zutnica (40), Gat (20), Trski Vrh (15), Zagora (15), and in Zagreb (<10).
Outside Croatia
Family name Gumbas is present in four countries on three 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.