In Croatia, Sumberac families are Croats (from Porec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Labin area. In Nedešćina in Labin area every sixtieth inhabitant had the family name Sumberac.
Prevalence
Only a few people with faimily name Sumberac live in Croatia today, in one household only. There were 190 of them in the middle of the past century, and their number decreased significantly. They are located in two Croatian counties, in one city and two other places, mostly in Rijeka (<5), Visnjan in Porec area (<5), and in Nedescina in Labin area (<5).
Outside Croatia
Family name Sumberac is present in 10 countries on four continents. The family name "Sumberac " is used by some 70 people in France , about 60 in the United States , and small number of people in Australia.
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.