Etymology and distribution of 皇.

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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Ratio of 皇.

カンマ区切りで複数の名字を指定できます。

Etymology of 皇

Distribution of 皇
Ranking
1 Kusatsu-shi(0.00436%)
2 Higashioumi-shi(0.0037%)
3 Yamato-shi(0.00271%)
4 Machida-shi(0.00271%)
5 Kyouto-shi Sakyou-ku(0.00269%)
6 Sagamihara-shi(0.000829%)