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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新潟県 十日町市 木和田原の名字

About 40 【中沢】6
About 30 【山岸】6
About 20 【石野】5
Very rare 【内山】6
Very rare 【佐藤】7