Etymology and distribution of 雄島.

Ojima 【雄島】^{レベル3
About 100}  The Japanese surnames etymology dictionary.

Hiroshima-ken , Oosaka-fu , Ehime-ken .

Originated from Okayama-ken Kasaoka-shi . Place name with a record since the North / South morning era.

② Topography . Tokushima-ken Tokushima-shi Tokushima-machi castle inside was in the Edo period in the Tokushima Samurai of the Clan office. In the early Edo period, the same clan says that he changed the pine tree of Kasamatsu surname "Oka". 笠松 Kasamatsu reference.