In Croatia, Giacaz families are Croats (from Buzet ).
Prevalence
About 20 people with faimily name Giacaz live in Croatia today, in one household only. There were 20 of them in the middle of the past century, and their number remains constant. They are located in only two naselja i to in Buzet (<5) and Veli Mlun (<5).
Outside Croatia
Family name Giacaz is present in three countries on two continents.