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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茨城県 つくば市 水堀の名字

About 120 【横田】6
About 30 【荒木】6
About 10 【染谷】6
About 10 【中川】7
Very rare 【奥山】6
Very rare 【吉田】7
Very rare 【山中】6