Okatama 【岡玉】1 The Japanese surnames etymology dictionary.
Gunma-ken , Ibaraki-ken , Toukyou-to . Originated from Gunma-ken Tomioka-shi Aino - noda (formerly Ono Village). A place name with a record since the Heian period. It was in the Edo era during the same period, Gunma-ken Fujioka-shi . Ibaraki-ken Shimotsuma-shi It was in the Azuchi-Momoyama period as a vassal of Mr. Taga Tani who was the castle owner of Shimozuma Castle in Honjo-cho.