Etymology and distribution of 宝岡.

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

Saitama-ken . 利根木 surname. Saitama-ken Kumagaya-shi was in the Edo period. At the same place Miyazaki-ken Nobeoka-shi Higashi Honmoto alley is said to be the descendant of Mr. Naito who was a Nobeoka clan in the clan government. 内藤 Naitou reference.