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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長野県 東筑摩郡筑北村 大沢新田の名字

About 30 【窪田】6
About 20 【一之瀬】5
About 20 【丸山】7
About 10 【小林】7
About 10 【山岸】6
Very rare 【大川】6
Very rare 【松沢】6
Very rare 【山口】7