Etymology and distribution of 生玉.

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 生玉.

カンマ区切りで複数の名字を指定できます。

Etymology of 生玉

Distribution of 生玉
Ranking
1 Nagano-ken(0.00295%)
2 Ehime-ken(0.000984%)
3 Kouchi-ken(0.000431%)
4 Kyouto-fu(0.000333%)
5 Akita-ken(0.0003%)
6 Hiroshima-ken(0.000288%)
7 Aomori-ken(0.000262%)
8 Kanagawa-ken(0.000184%)
9 Toukyou-to(0.000149%)
10 Hokkaidou(0.00014%)
11 Chiba-ken(Very rare)