Hiroki 【広木】5 The Japanese surnames etymology dictionary.
① Topography . From water and swans. Okayama-ken Tsuyama-shi I was in Warring States during the Warring States Period. In the same place, say that Misawa surname was from Shimane-ken eastern part (formerly Izumo nation). 三沢 reference. Nagano-ken Kamiminochi-gun Shinano-machi Oi was in the Edo era. Niigata-ken Nagaoka-shi Mizusawa is a place name with a record since the Edo period.