Pivac families are Croats and they are mostly from Vrgorac. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Vrgorac. In Zavojane in Vrgorac every tenth inhabitant had the family name Pivac.
About 570 people with faimily name Pivac live in Croatia today, in 230 households. There were 400 of them in the middle of the past century, and their number increased by 40 percent. They are located in the most of Croatian counties, in 29 cities and 30 other places, mostly in Split (115), Zagreb (70), Makarska (70), Zavojane (35), and in Vrgorac (25).