In Croatia, Jacin families are mainly Croats (from Pazin ), rarely Slovenes (from Umag ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Pazin and in Slovenia.
Prevalence
About 10 people with faimily name Jacin 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 only four naselja i to in Pazin (<5), Umag (<5), Babici (<5), and in Finida (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.