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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滋賀県 蒲生郡竜王町 島の名字

About 30 【村井】6
About 20 【松岡】6
About 10 【岡田】7
About 10 【沢田】6
Very rare 【澤田】6
Very rare 【森島】5