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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愛知県 西尾市 中外沢元銭成の名字

About 30 【外山】6
About 10 【吉田】7
About 10 【田中】7
Very rare 【石崎】6
Very rare 【板倉】6
Very rare 【小倉】6
Very rare 【高瀬】6
Very rare 【沢田】6