Etymology and distribution of 磐井.

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 磐井.

カンマ区切りで複数の名字を指定できます。

Etymology of 磐井

Distribution of 磐井
Ranking
1 Miyagi-ken(About 50)
2 Hokkaidou(About 30)
3 Chiba-ken(About 20)
3 Iwate-ken(About 20)
5 Saitama-ken(About 10)
5 Toukyou-to(About 10)
7 Tochigi-ken(About 10)
8 Mie-ken(Very rare)
8 Hyougo-ken(Very rare)
8 Kanagawa-ken(Very rare)
8 Shizuoka-ken(Very rare)