「Kao」(かお)さんの名字の由来、語源、分布。

① Originated from Katsurenai of Okinawa-ken Uruma-shi . A place name with a record since the Kingdom of the Ryukyus. The Ryukyuan sound is a catchen.

② 桂 There surname. Tottori-ken Yazu-gun Yazu-chou The owner of Hashimoto's Oe shrine pronounced Katsura. There is a belief that Tottori-ken Eastern (formerly Inaba) had forest name. 桂 Katsura reference. 林 Hayashi reference.

2023年 3月 11日更新

Whole Japan		Prefectures
レベル	2	1　Kyouto-fu(About 10) 2　Fukuoka-ken(Very rare) 2　Fukui-ken(Very rare) 2　Shiga-ken(Very rare) 2　Hyougo-ken(Very rare)
Population	About 30
Ranking	Out of ranking

Rank by city
1　Maidzuru-shi(About 10) 2　Konan-shi(Very rare) 2　Kitakyuushuu-shi Yahatanishi-ku(Very rare) 2　Obama-shi(Very rare) 2　Amagasaki-shi(Very rare)