Choukan 【張簡】2 The Japanese surnames etymology dictionary.
Yamaguchi-ken . Originated from Yamaguchi-ken Shuunan-shi (formerly Tono-gun). In the Asuka era "place of anger" in the place of the place with a record. In the Kofun Period, say "horn" and said that they called the horn of Mr. Kakuno on the same place. 角 reference.