The Japanese surnames etymology dictionary.
Chiba-ken Ichihara-shi , Chiba-ken Sodegaura-shi . Creation . Chiba-ken Ichihara-shi Tell me that Tatsuno gave it to Mr. Tatsuno by switching the bow and arrow of Yoritomo who is the warrior of the Heian period and the Kamakura period. It was in the Edo period in the same place. 立野 reference.