Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
https://play.google.com/store/apps/details?id=info.jigensha.jcedfreeGoogle Play で手に入れよう https://apps.apple.com/us/app/id1471109324
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岩手県 八幡平市 田の沢の名字

About 60 【小笠原】6
About 50 【羽沢】4
Very rare 【佐藤】7
Very rare 【羽澤】3