Etymology and distribution of 高加.

Kouka 【高加】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Nagasaki-ken Gotou-shi , Fukuoka-ken , Yamaguchi-ken . Terrain . In Yamaguchi-ken , saying that Nagasaki-ken 's sake had many Sakai surnames, he added "side" as Sakai as "border". 酒井 Sakai reference.