Etymology and distribution of 根口.

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
↑オフライン検索できるアプリもどうぞ
在日通名大全

日本初、在日通名の研究書「在日通名大全」発売中!
ネットの電話帳 住宅地図 マッポン!

「根口」さんの名字の分布数。

カンマ区切りで複数の名字を指定できます。

Etymology of 根口

Distribution of 根口
Ranking
1 Hata-gun Ootsuki-chou(About 30)
2 Ninohe-gun Ichinohe-machi(About 20)
3 Nakatsu-shi(About 10)
3 Shimonoseki-shi(About 10)
3 Takizawa-shi(About 10)
3 Kouchi-shi(About 10)
7 Maidzuru-shi(Very rare)
7 Koube-shi Nagata-ku(Very rare)
7 Saitama-shi(Very rare)
7 Yashio-shi(Very rare)
7 Wakou-shi(Very rare)
7 Hasuda-shi(Very rare)
7 Habikino-shi(Very rare)
7 Nobeoka-shi(Very rare)
7 Kunohe-gun Kunohe-mura(Very rare)
7 Kunohe-gun Hirono-chou(Very rare)
7 Ninohe-shi(Very rare)
7 Chita-shi(Very rare)
7 Yokohama-shi Tsurumi-ku(Very rare)
7 San'nohe-gun San'nohe-machi(Very rare)
7 Hachinohe-shi(Very rare)
7 Sukumo-shi(Very rare)