Etymology and distribution of 古岳.

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

Mie-ken , Wakayama-ken , Oosaka-fu .

① Mie-ken Kumano-shi Birthplace originated from a shrine dedicated to the Kiwa Machiya plateau (Saraya).

② Wakayama-ken Shinguu-shi In Kotonogawa Town I tell him that he was engaged in agriculture and forestry. Estimated in the Edo period. Nara-ken Yoshino-gun Kawakami-mura Distributed in the middle. There is a 更江 surname on the same 更江 . 更江 Sarae reference.