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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新潟県 上越市 大原の名字

About 70 【南雲】5
About 40 【仙田】5
About 10 【数井】4
About 10 【田久保】5
Very rare 【秋山】6
Very rare 【横尾】6