Etymology and distribution of 澄岡.

Sumioka 【澄岡】^{レベル3
About 70}  The Japanese surnames etymology dictionary.

Tochigi-ken Ashikaga-shi . A variant of 田部井 . Tochigi - ken Ashikaga - shi In Awa - machi, tell them that they were engaged in agriculture by pioneering. 田部井 Tabei reference.