Oosawa 【大澤】6 The Japanese surnames etymology dictionary.
Hokkaidou , Toyama-ken , Ishikawa-ken . Originated from Saitama-ken Okegawa-shi . In the North and South morning era, the name of the place with a record as "Turtle skin" notation. There is a shop name of Tubuya. Ishikawa-ken Kaga-shi Mashihashi Town, Tokushima-ken Naruto-shi Distributed in Naruto- cho Takashima Kita. Nagano-ken Matsumoto-shi Marunouchi was in the Edo period in the clan of Matsumoto of the Clan Office.