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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岩手県 二戸郡一戸町 出ル町泉沢の名字

About 60 【泉久保】3
About 10 【堺田】4
About 10 【田中】7
Very rare 【泉沢】5
Very rare 【小松】6
Very rare 【田口】6