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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福島県 南相馬市 信田沢欅の名字

About 30 【二谷】4
About 10 【佐藤】7
About 10 【西内】5
Very rare 【大井】6
Very rare 【鹿山】5
Very rare 【郡山】5
Very rare 【紺野】5
Very rare 【佐久間】6
Very rare 【白瀬】4
Very rare 【白鳥】6
Very rare 【山本】7