Etymology and distribution of 古佐田.

Kosada 【古佐田】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Yamaguchi-ken . Tokushima-ken Myouzai-gun Kamiyama-chou Birth origin of the lower left and right (southern). Place name with a record in the notation of "Sa" in the Nanboku morning era. Tradition in Shimane-ken western part (formerly Iwami-kuni). It says that Mr. Sasaki was called in Kamakura period in the same place. 佐々木 Sasaki reference.