Etymology and distribution of 寶岡.

Takaraoka 【寶岡】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Toyama-ken , Hyougo-ken , Hiroshima-ken . Kanagawa-ken Ashigarashimo-gun Yugawara-machi Origin of soil fertilizer. A place name with a record since the Nara period. In Kumamoto-ken Yatsushiro-shi 's Gosonso it tells that he gave Genji's soil fertilizer name to hide that he is a Heike. 平 Taira reference.

※ Shizuoka-ken Izu-shi Daito (Toi) is a place name with a record since the Edo period. In the Warring States Period, the place name was referred to as " Nishihito ", distinguished from Kanagawa-ken Ashigarashimo-gun Yugawara-machi soil fertilizer.

※ Hyougo-ken Asago-shi Saspension fertilizer (toys) is distributed. A place name with a record since the Edo period.

※ Vietnamese system . There is a record of naturalization on Hyougo-ken Akashi-shi on 2 December 1975. There is also "Doi". Estimated kanji representation is included.