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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熊本県 葦北郡芦北町 大川内東の名字

Very rare 【内山】6
Very rare 【宇土】5
Very rare 【椛谷】3
Very rare 【森下】6