Etymology and distribution of 姚.

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 姚.

カンマ区切りで複数の名字を指定できます。

Etymology of 姚

Distribution of 姚
Ranking
1 Hyougo-ken(About 30)
2 Toukyou-to(About 20)
3 Oosaka-fu(About 20)
4 Chiba-ken(About 10)
4 Wakayama-ken(About 10)
6 Saitama-ken(About 10)
6 Niigata-ken(About 10)
6 Kanagawa-ken(About 10)
9 Ehime-ken(Very rare)
9 Fukuoka-ken(Very rare)
9 Kagawa-ken(Very rare)