Etymology and distribution of 染澤.

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

Yamaguchi-ken Shuunan-shi . Terrain . In Yamaguchi-ken tells that Mr. Sako dispatched "East" by dispatching to the east. Estimated in the Edo period. 佐古 Sako reference.