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 南佐久郡小海町 小海芦谷の名字

About 70 【黒沢】6
About 20 【井出】6
About 10 【小林】7
About 10 【松本】7
Very rare 【中島】7
Very rare 【渡辺】7