Etymology and distribution of 内添.

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 内添.

カンマ区切りで複数の名字を指定できます。

Etymology of 内添

Distribution of 内添
Ranking
1 Kagoshima-ken(0.00183%)
2 Kumamoto-ken(0.000228%)
3 Gunma-ken(0.000203%)
4 Hyougo-ken(0.000164%)
5 Kanagawa-ken(Very rare)
6 Oosaka-fu(Very rare)