Etymology and distribution of 圓座.

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

Yamanashi-ken , Toukyou-to . Yamanashi-ken Kitatsuru-gun Tabayama-mura Origin of Okuchi. Mr. Okuwaki of Yamanashi-ken Fujiyoshida-shi tells that it was described as "Okubi" during the Warring States Period. 奥脇 Okuwaki reference.