Etymology and distribution of 杤岡.

Tochioka 【杤岡】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Fukuoka-ken , Kumamoto-ken , Shizuoka-ken .

① Kumamoto-ken Tamana-gun Nagasu-machi Origin of belly red (Haraka). A place name with a record in the notation of "鰚" during the Warring States Period. The place name was also written as "Hara" and "Haraga". Kumamoto-ken Kumamoto-shi Chuo-ku Honmaru was in the Edo era at the Kumamoto clan in the Clan office.

② There are 原 surname. "Ga" is a favorable character. 原 Hara reference.