Etymology and distribution of 島口.

Shimaguchi 【島口】^{レベル4
About 1,200}  The Japanese surnames etymology dictionary.

Toyama-ken Oyabe-shi . Birth of Toyama-ken Nanto-shi Takubuki (aka Takagi). A place name with a record since the Warring States Period. Toyama-ken Oyabe-shi Meiji New surname by monks of Jodo-ji Temple in Chuo-machi. Tell the original location of the temple that it was founded from 1573 to 1592 (Tensho year). The mountain of the temple is Takakiyama.