Tanizawa 【谷沢】5 The Japanese surnames etymology dictionary.
Akita-ken Akita-shi . Originated from Senju, Toukyou-to Adachi-ku . A place name with a record since the Edo period. Akita-ken Akita-shi In Omachi tells that he combined the "Sen" of Senju and "Gama" of Gamo (gamo) with their real name to 1614 (Keicho 19 years). 蒲生 reference.