Etymology and distribution of 坪沢.

Tsubosawa 【坪沢】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Aomori-ken , Hokkaidou , Kanagawa-ken . Thing . Netsude is another name for green onion. Ehime-ken Minamiuwa-gun Ainan-chou There was a case that Netherwin surname was renamed to Meiji Shin surname in Arai Arah. 根沢 Nezawa reference.