In Croatia, Diači families are predominantly Croats (from Labin ), rarely Italians (also from Labin ). In the past century, relatively most of Croatian residents bearing this family name were born in Labin.
Prevalence
Only a few people with faimily name Diači live in Croatia today, in one household only. They are located in one Croatian city only, in Labin (<10).
Outside Croatia
Family name Diači (including: Diazzi , Diacci and Diaci ) is present in 15 countries worldwide. The family name "Diaci " 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 2007 in source Encyclopaedia of Croatian Surnames.