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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兵庫県 養父市 伊豆の名字

About 70 【政次】4
About 70 【小野山】5
About 30 【岡田】7
About 20 【河浪】3
Very rare 【岡本】7
Very rare 【政清】3