Etymology and distribution of 井戸井.

Idoi 【井戸井】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Yamaguchi-ken Hagi-shi .

① Topography . From the place to draw water and from the town. Yamaguchi-ken Hagi-shi Tsubaki - dori is based. Yamaguchi-ken Houfu-shi There is a record in Hofuten Tenman-gu in Matsuzaki Town in 1365 (Sadaharu 4, Shingei 20 years).

② Kagoshima-ken Izumi-shi Originated from Ichimachi, a small name in Noda-machi. On the same day there was a well town gate of the gate division system in the Edo period.