The Japanese surnames etymology dictionary.
Yamaguchi-ken , Hiroshima-ken . Creation . Tell him that he had won a third of the territory by war. There was a record in Yamaguchi-ken in 1493 (2nd year in the second year). Last name is also written as "three step one". Yamaguchi-ken Iwakuni-shi Miwa town There is one third in the shrine of Shimodate . The place name is estimated from the person's name.