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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福井県 吉田郡永平寺町 岩野の名字

About 20 【釼内】2
About 10 【中村】7
Very rare 【岩田】6
Very rare 【畑中】6
Very rare 【前沢】5