In Croatia, Jadrejčić families are generally Croats (from Rovinj ), very rarely Italians (from Pula ). In the past century, relatively most of Croatian residents bearing this family name were born in Pula and in Pazin area.
Prevalence
About 30 people with faimily name Jadrejčić live in Croatia today, in 8 households. There were 10 of them in the middle of the past century, and their number tripled. They are located in only five naselja i to in Pula (10), Rovinj (<10), Buje (<10), Valtura in Pula area (<5), and in Kanfanar in Rovinj area (<5).
Outside Croatia
Family name Jadrejčić is present in this form only in Croatia.
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.