Katou 【河隝】2 The Japanese surnames etymology dictionary.
Nagano-ken , Toukyou-to . Nagano-ken Ina-shi Originated from Karaki, a stalwart of Nishinaga nearby. Nagano-ken Ina-shi It was in Edo era in Yokoyama. I tell him that he came from Shizuoka-ken eastern part (formerly Izukuni) in the Kamakura period. Kagawa-ken Sanuki-shi Tsuda Town tells Tsuda was engaged in fishery. Estimated in the Edo period.