Etymology and distribution of 小井澤.

Koizawa 【小井澤】^{レベル3
About 60}  The Japanese surnames etymology dictionary.

Tokushima-ken . Tokushima-ken Itano-gun It was in the Edo period in Matsushige-chou . In the same place, Nagano-ken refers to Yasuhara surname, and from 1182 to 1184 (Susonaga years), tell the fact that Tokushima-ken Itano-gun Itano-chou Kawabata lands were given by military. 泰原 Yasuhara reference.