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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長野県 下水内郡栄村 堺小赤沢の名字

About 110 【福原】6
About 90 【山田】7
About 20 【阿部】7
Very rare 【小野】7
Very rare 【関】6
Very rare 【藤ノ木】4