Etymology and distribution of 栂岡.

Tsugaoka 【栂岡】^{レベル3
About 50}  The Japanese surnames etymology dictionary.

Ibaraki-ken , Iwate-ken , Toukyou-to . Terrain . From the swamp and the projecting land. Ibaraki-ken Inashiki-gun Miho-mura It was in the Edo period for receipt. Tell them that they are groundbreaking in the same place. Chiba-ken Sakura-shi Castle town was in the Edo era in the clan Sakura of the Clan office.

※ Ibaraki-ken Tsukuba-shi Numazaki is a place name with a record since the Sengoku period.

※ Iwate-ken Shimohei-gun Yamada-machi In Orikasa he tells that he resides in the same place and called it from the place name of Numakazaki. Period, location unknown.