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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青森県 三戸郡三戸町 斗内中堤下平の名字

About 10 【川瀬】6
About 10 【百沢】3
Very rare 【遠瀬】3