Etymology and distribution of 小間海.

Komagai 【小間海】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Toukyou-to Hachiouji-shi . Sina system . Terrain . Added "village" to application. Named after Toukyou-to Hachiouji-shi naturalized on August 15, 1997. The real name is applied. 施 Shi reference.