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 南佐久郡佐久穂町 畑中畑の名字

About 20 【小須田】5
About 20 【水上】6
About 20 【今井】7
About 10 【富沢】5
Very rare 【相馬】6
Very rare 【碓井】5
Very rare 【小林】7
Very rare 【中島】7
Very rare 【渡辺】7