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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長野県 東筑摩郡筑北村 湯戸坂口の名字

About 30 【若林】6
About 10 【宮嶋】5
About 10 【山本】7
About 10 【吉原】6
Very rare 【内山】6
Very rare 【栗林】6
Very rare 【滝沢】6
Very rare 【滝澤】5
Very rare 【宮島】6