Etymology and distribution of 磐上.

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 磐上.

カンマ区切りで複数の名字を指定できます。

Etymology of 磐上

Distribution of 磐上
Ranking
1 Honjou-shi(About 30)
2 Kawaguchi-shi(About 10)
3 Matsudo-shi(Very rare)
3 Ageo-shi(Very rare)
3 Kodama-gun Kamisato-machi(Very rare)
3 Fujiyoshida-shi(Very rare)
3 Koufu-shi(Very rare)
3 Hamura-shi(Very rare)
3 Fujioka-shi(Very rare)
3 Takasaki-shi(Very rare)
3 Iwata-shi(Very rare)