Koshimo 【古下】3 The Japanese surnames etymology dictionary.
Hiroshima-ken Fukuyama-shi , Kagawa-ken , Hokkaidou Iburishi-chou Touyako-chou . Distribution including saiki as well. A variant of 佐伯 . Kagawa-ken Mitoyo-shi Itsukuchima 's Itsukushima Shrine tells Hiroshima-ken Hatsukaichi-shi that the shrine of Saito surname of Itsukushima Shrine in Miyajima Town was built from 1504 to 1521 (Year Period). In Kagawa-ken there is also a story that the shrine of the company was originally Saeki surname, the head family used the octopus, and the branch pronounced the saiki. 佐伯 reference.