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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熊本県 菊池市 四町分岩下の名字

About 50 【河上】5
About 50 【岩崎】6
About 40 【福田】7
Very rare 【田中】7