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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Popuration 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 Machida-shi(About 10)
2 Kyouto-shi Sakyou-ku(Very rare)
2 Higashioumi-shi(Very rare)
2 Kusatsu-shi(Very rare)
2 Yamato-shi(Very rare)
2 Sagamihara-shi(Very rare)