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 宮古市 川井第6地割の名字

About 10 【船ケ沢】2
About 10 【山口】7
About 10 【戸草】3
About 10 【野口】6
Very rare 【上澤】4
Very rare 【古館】5
Very rare 【館石】4
Very rare 【長友】5
Very rare 【野尻】5
Very rare 【前川】6