Etymology and distribution of 巌間.

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

Niigata-ken , Toukyou-to . Origin of Niigata-ken Sado-shi Komyo. A place name with a record since the Edo period. The place name conveys a song in the Muromachi period and gives it as a prize and tells the meaning "instead of song". It was in the Niigata-ken Kashiwazaki-shi during the Warring States Period.