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 豊川市 当古町一色の名字

About 50 【中山】7
About 20 【外山】6
Very rare 【武田】7
Very rare 【夏目】5
Very rare 【堀川】6