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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秋田県 北秋田市 七日市の名字

About 50 【長岐】4
About 30 【山城】6
Very rare 【岩本】6
Very rare 【佐藤】7
Very rare 【千葉】6
Very rare 【永井】6
Very rare 【畠山】6
Very rare 【堀部】5
Very rare 【松前】5