Etymology and distribution of 俊岡.

Toshioka 【俊岡】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Kagoshima-ken Ooshima-gun Kikai-chou · Oosaka-fu . Terrain . "Mine" was added to the sun which is the surname of Amagi archipelago of Kagoshima-ken . Tell Kagoshima-ken that you changed your name from sunny surname because it is confusing with Korea people when you go out to Toukyou-to . Estimated in around 1930. 晴 Hare reference.