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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青森県 十和田市 赤沼向川原の名字

About 40 【東】6
About 20 【杉山】7
About 20 【南】6
About 10 【下佐】3
About 10 【沼岡】3
About 10 【沼田】6
Very rare 【後沢】3
Very rare 【加賀沢】3
Very rare 【前川原】3