Etymology and distribution of 円界.

Enkai 【円界】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Aichi-ken , Kanagawa-ken , Niigata-ken .

① Aichi-ken Inazawa-shi Origin of Oya-cho. A place name with a record since the Kamakura period. The place name was also written as "Otani" and "Oya". Good neighbor . Hyougo-ken Himeji-shi Distributed in Shimosato - cho Uenbell.

② variant of the 大屋 . Niigata-ken Tsubame-shi In Kumamori told that it was written as "Oya". Estimated in the Edo period.

③ Gifu-ken Takayama-shi Originated from Ojya, a small figure of Jiichi Town.

④ Kumamoto-ken Ashikita-gun Ashikita-machi brought up from Oya Oshii . It is distributed in the same place.

⑤ Occupation . Iwate-ken Ninohe-gun Ichinohe-machi Iwate Takayo tells you from the owner of the landlord (Oya). Meiji New Last name in estimation.