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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静岡県 掛川市 今滝の名字

About 70 【溝口】6
About 70 【松本】7
About 30 【永田】6
About 10 【杉浦】6
About 10 【山田】7
Very rare 【大井】6