In Croatia, Gajan families are Croats (from Jastrebarsko area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
About 20 people with faimily name Gajan live in Croatia today, in 8 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in only four Croatian places: in Zagreb (<10), Kupinecki Kraljevec (<10), Rakov Potok (<5), and in Kupinec in Jastrebarsko area (<5).