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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神奈川県 足柄上郡中井町 古怒田の名字

About 50 【早野】5
About 30 【小島】7
About 30 【石井】7
About 10 【吉野】6
About 10 【尾尻】4
Very rare 【小田切】5
Very rare 【菊地】6
Very rare 【椎野】5
Very rare 【中井】6
Very rare 【細野】6