In Croatia, Čaja families are Croats (from Novska ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Novska.
Prevalence
About 10 people with faimily name Čaja live in Croatia today, in five households only. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located in only five naselja i to in Zagreb (<10), Nova Subocka (<5), Karlovac (<5), Djelekovec in Koprivnica area (<5), and in Slakovci in Vinkovci area (<5).