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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茨城県 常陸大宮市 吉丸の名字

About 40 【上久保】5
About 40 【桑名】5
About 30 【関】6
About 30 【長嶋】5
About 10 【内田】7
About 10 【小林】7
About 10 【三村】6
About 10 【相川】6
About 10 【大武】5
Very rare 【田口】6
Very rare 【本橋】6
Very rare 【柳沢】6