Etymology and distribution of 當瀬.

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 當瀬.

カンマ区切りで複数の名字を指定できます。

Etymology of 當瀬

Distribution of 當瀬
Ranking
1 Miyazaki-ken(0.0017%)
2 Hokkaidou(0.000349%)
3 Toyama-ken(0.000342%)
4 Gifu-ken(0.000189%)