Etymology and distribution of 恩海.

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

Ehime-ken Yawatahama-shi . A variant of 角田 . Ehime-ken Uwajima-shi Marunouchi was in the Edo period in the Uwajima clan in the Clan Office. Tell the same clan that Kouchi - ken is out. 角田 Tsunoda reference.