In Croatia, Šišac families are Croats (from Pula ). In the past century, relatively most of Croatian residents bearing this family name were born in Pula area and in Pula.
Prevalence
Only a few people with faimily name Šišac live in Croatia today, in one household only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are located in only one small Croatian place, in Banjole in Pula area (<5).
Outside Croatia
Family name Šišac (including: Sisac , Sissac ) is present in five countries on two continents. The family name "Sisac " is used by small number of people in the United States. "Sissac " is used by some 100 people in the United States and small number in France.