Etymology and distribution of 古閑山.

Kogayama 【古閑山】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Shimane-ken Oochi-gun Kawamoto-machi , Yamaguchi-ken . 佐田野 variant of. Shimane - ken Oochi - gun Kawamoto - machi is the base of the causality . Shimane-ken Oochi-gun Kawamoto-machi It is said that he returned to the warring country era after castle castle of hot water castle which was in Kawamoto. 佐田野 Sadano reference.