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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福島県 耶麻郡西会津町 宝坂宝坂宝川乙の名字

About 40 【雅楽川】3
About 30 【佐藤】7
About 20 【小原】6
About 10 【渡部】6
Very rare 【上野】6
Very rare 【浅井】6
Very rare 【五十嵐】6
Very rare 【小堀】6
Very rare 【堀江】6