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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富山県 下新川郡入善町 東五十里の名字

About 100 【五十里】4
About 10 【長津】5
Very rare 【清水】7
Very rare 【竹内】7
Very rare 【堂徳】3
Very rare 【藤井】7
Very rare 【真岩】4
Very rare 【水島】6
Very rare 【横山】7