Etymology and distribution of 洞嶺.

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

Kagoshima-ken Ooshima-gun Kikai-chou . Terrain . "Oka" was added to the sun which is the surname of the Amami archipelago of Kagoshima-ken . Estimated at the time of returning to Japan in 1953. 晴 Hare reference.