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 大沼郡金山町 沼沢南上村の名字

About 10 【五ノ井】4
About 10 【佐藤】7
Very rare 【川辺】6
Very rare 【坂内】5
Very rare 【鈴田】4
Very rare 【若林】6