Imanaga 【今永】4 The Japanese surnames etymology dictionary.
① Origin of Shimane-ken Western (formerly Iwami-kun). A place name with a record since the Asuka period. Niigata-ken Sado-shi Tradition at Himezu. Tell the story that descendants of fishermen who came from 1596 to 1615 (Keicho year) called.
② Hyougo-ken Ibo-gun Taishi-chou Originated in the vicinity of the Ishihama shrine (formerly Iwami Township) in Miyamoto. A place name with a record since the Muromachi period. Tradition in Shimane-ken western part (formerly Iwami-kuni).