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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岐阜県 揖斐郡揖斐川町 大洞の名字

About 150 【山岸】6
About 140 【竹中】6
About 100 【石原】6
About 10 【三島】6
About 10 【小木曽】5
About 10 【鈴木】7
Very rare 【宇佐美】6
Very rare 【平尾】6