Sasaoka 【笹岡】5 The Japanese surnames etymology dictionary.
① Topography . From the Shimodake gate of the gate division system that was in the Edo era. An example of the location of the gate. Kagoshima-ken Ichikikushikino-shi Osato, Kagoshima-ken Hioki-shi Higashiichirokucho Yuda, Miyazaki-ken Miyakonojou-shi Takagi-cho, Miyazaki-ken Miyakonojou-shi Tarouro cho. The gate name comes from the pond below.