Etymology and distribution of 日口.

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!

「日口」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 日口

Distribution of 日口
Ranking
1 Matsusaka-shi(About 40)
2 Hita-shi(About 20)
3 Maniwa-shi(About 10)
3 Akaiwa-shi(About 10)
5 Tsu-shi(About 10)
5 Toyonaka-shi(About 10)
5 Nara-shi(About 10)
5 Okayama-shi(About 10)
9 Takikawa-shi(Very rare)
9 Yotsukaidou-shi(Very rare)
9 Suita-shi(Very rare)
9 Neyagawa-shi(Very rare)
9 Ikeda-shi(Very rare)
9 Takatsuki-shi(Very rare)
9 Mine-shi(Very rare)
9 Souja-shi(Very rare)
9 Takahashi-shi(Very rare)
9 Kodaira-shi(Very rare)
9 Musashimurayama-shi(Very rare)
9 Kusatsu-shi(Very rare)
9 Yokohama-shi Kounan-ku(Very rare)
9 Saihaku-gun Daisen-chou(Very rare)