Grahovac families are frequently Croats and they are mostly from Otocac. According to some sources they are from Novigrad Podravski near Koprivnica. Grahovci can be Serbs and Montenegrins. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Otocac. In Ramljani in Otocac every fourth inhabitant had the family name Grahovac.
About 1000 people with faimily name Grahovac live in Croatia today, in 480 households. There were 1000 of them in the middle of the past century, and their number remains constant. They are located in almost all Croatian counties, in 56 cities and 116 other places, mostly in Zagreb (230), Rijeka (65), Slatina (45), Ramljani (45), and in Velika Gorica (40).