Sadayoshi 【貞由】1 The Japanese surnames etymology dictionary.
Niigata-ken Jouetsu-shi , Toukyou-to . Niigata-ken Jouetsu-shi It was in the Edo era in Sanwa Ward Kawaura. In the same town Gunma-ken Oota-shi Toriyama Town is said to have been Toriyama surname. 鳥山 reference. Niigata - ken Mitsuke - shi The town of Shimodori (Simodori) is a place name recorded in the notation of "Sobori" during the Warring States Period.