Etymology and distribution of 定岡.

Sadaoka 【定岡】^{レベル4
About 1,400}  The Japanese surnames etymology dictionary.

Toyama-ken , Hokkaidou , Oosaka-fu . Terrain . From cedar and forest. Toyama-ken Toyama-shi Honmaru was in the Edo period in the clan of Toyama of the Clan office. Toyama-ken Toyama-shi Cedar forest of Nagaoka's small figure is a place name unknown in the record era. Toyama-ken Toyama-shi Mizuhashi It is a place name with a record since the Edo period. It was in the Edo period in the same place. Toyama-ken Toyama-shi Yao-cho Oosugi is a place name with a record since the Edo period. It is distributed in the same place.