In Croatia, Giačić families are Croats (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Osijek.
Prevalence
About 10 people with faimily name Giačić live in Croatia today, in four households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, in one city and another small place , mostly in Rijeka (<10) and Fazana (<5).
Outside Croatia
Family name Giačić (including: Giacic , Giacich ) is present in three countries on two continents. "Giacich " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.