Etymology and distribution of 俊岡.

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 俊岡.

カンマ区切りで複数の名字を指定できます。

Etymology of 俊岡

Distribution of 俊岡
Ranking
1 Kagoshima-ken(0.00122%)
2 Hiroshima-ken(0.000144%)
3 Oosaka-fu(Very rare)