In Croatia, Kao families are Croats (from Nova Gradiska ). In the past century, relatively most of Croatian residents bearing this family name were born in Nova Gradiska and Pozega.
Prevalence
About 30 people with faimily name Kao live in Croatia today, in 10 households. There were 10 of them in the middle of the past century, and their number tripled. They are located and two other Croatian places, mostly in Nova Gradiska (15), Resetari in Nova Gradiska area (<10), Pozega (<10), Zagreb (<10), and in Cernik in Nova Gradiska area (<5).