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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京都府 南丹市 諸畑福本の名字

About 30 【竹井】5
About 10 【山本】7
Very rare 【寺沢】6