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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Ratio 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(0.00229%)
2 Iwate-ken(0.00143%)
3 Hokkaidou(0.000559%)
4 Tochigi-ken(0.000444%)
5 Chiba-ken(0.000441%)
6 Saitama-ken(0.00022%)
7 Mie-ken(0.000219%)
8 Toukyou-to(0.000149%)
9 Shizuoka-ken(0.000111%)
10 Hyougo-ken(Very rare)
11 Kanagawa-ken(Very rare)