Etymology and distribution of 片本.

Katamoto 【片本】^{レベル4
About 800}  The Japanese surnames etymology dictionary.

Toyama-ken . Toyama-ken Takaoka-shi Origins of Kamoshima (Camojima) town. A place name with a record since the Edo period. The place name was pointing to the area around Chiba River which flows through Toyama-ken Takaoka-shi in the old days. She also says that her last name was written as "Kamojima". It is unknown whether Koho island exists.