Etymology and distribution of 砥石.

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
↑オフライン検索できるアプリもどうぞ

Ratio of 砥石.

カンマ区切りで複数の名字を指定できます。

Etymology of 砥石

Distribution of 砥石
Ranking
1 Nagano-ken(0.00869%)
2 Fukushima-ken(0.00241%)
3 Yamagata-ken(0.000933%)
4 Nara-ken(0.000891%)
5 Hokkaidou(0.000559%)
6 Kanagawa-ken(0.000552%)
7 Wakayama-ken(0.000342%)
8 Chiba-ken(0.000265%)
9 Mie-ken(0.000219%)
10 Gunma-ken(0.000203%)
11 Niigata-ken(0.000161%)
12 Toukyou-to(0.000149%)
13 Saitama-ken(0.000147%)
14 Hyougo-ken(Very rare)
15 Oosaka-fu(Very rare)