The Japanese surnames etymology dictionary.
Tokushima-ken , Akita-ken , Kagawa-ken . Toukyou-to Higashimurayama-shi Origin of Kumagawa Town. A place name with a record since the Kamakura period. Tokushima-ken Myouzai-gun Ishii-chou There is a tradition in Urasho. Tokushima-ken Mima-shi was in the Edo period. Tell him that he changed the name from Kono surname in the same place. 河野 reference.