In Croatia, Kajin families are Croats (from Buzet ), barely Slovenes (also from Buzet ). In the past century, relatively most of Croatian residents bearing this family name were born in Buzet and in Slovenia. In Kajini in Buzet every second inhabitant had the family name Kajin.
Prevalence
About 70 people with faimily name Kajin live in Croatia today, in 30 households. There were 110 of them in the middle of the past century, and their number decreased by 40 percent. They are only located in in 7 Croatian cities and 6 other places, mostly in Kajini (15), Strped (10), Vrh (10), Sveti Martin (<10), and in Buzet (<10).
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.