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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長野県 飯山市 坂井の名字

About 100 【小林】7
About 60 【中村】7
About 50 【堀】6
About 30 【西条】5
About 30 【佐藤】7
About 20 【吉田】7
Very rare 【清水】7
Very rare 【西條】5
Very rare 【島田】6
Very rare 【丸山】7