In Croatia, Sopjanac families are almost entirely Croats (from Slatina area ), barely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Slatina area and in Osijek.
Prevalence
About 60 people with faimily name Sopjanac live in Croatia today, in 30 households. There were 90 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 7 Croatian counties, in 6 cities and 12 other places, mostly in Noskovci in Slatina area (20), Josipovac (15), Zagreb (10), Sopje in Slatina area (<10), and in Pakrac (<10).
Outside Croatia
Family name Sopjanac is present in four countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.