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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愛知県 田原市 中山田端の名字

About 80 【森下】6
About 70 【小川】7
About 30 【川口】6
About 10 【土井】6
About 10 【中川】7
Very rare 【河合】6