Etymology and distribution of 恩海.

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

Niigata-ken Nagaoka-shi , Chiba-ken , Aomori-ken .

① Niigata-ken Niigata-shi Kamen Ward Kanase is a place name with a record since the Edo period. The place name was also written as "Kase" and "Kase".

② Aomori-ken Goshogawara-shi Kanamechi Kame is a place name with a record since the Edo period. The place name was also written as "Jiao", "Jiaqing", "Kaisei". Aomori-ken Hirosaki-shi Shimogaro silver town was in the Edo period in the Hirosaki clan of the clan office.

③ variant of 加瀬 .