Etymology and distribution of 於土井.

Odoi 【於土井】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Iwate-ken Ninohe-shi . Terrain . Iwate-ken Morioka-shi Uchimaru was in the Edo period in the clan san Morioka of the clan government. According to the same clan says Mr. Itagaki who came from Yamanashi-ken in accordance with Mr. Minami in 1191 (2 years of Construction) was at the edge of the lacked land. 板垣 Itagaki reference.