In Croatia, Rusac families are generally Croats (from Pazin ), very rarely Serbs, and . In the past century, relatively most of Croatian residents bearing this family name were born in Pazin and Pula. In Tinjan in Pazin area every sixtieth inhabitant had the family name Rusac.
Prevalence
About 40 people with faimily name Rusac live in Croatia today, in 20 households. There were 40 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties and two other places, mostly in Pazin (20), Tinjan in Pazin area (<10), Vela Traba (<10), Pula (<10), and in Porec (<5).
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.