Etymology and distribution of 渓岡.

Tanioka 【渓岡】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Kumamoto-ken , Kagoshima-ken . There is 中隈 surname. Kumamoto-ken Kamimashiki-gun It was in the Edo period in Mifune-machi . It is said that the warring country era was Kai surname in the same place. 甲斐 Kai reference.