The Yamaguchi clan in Byodobo, Yamabe County (present Byodobo-cho, Tenri City) was a descendant of Naotomo YAMAGUCHI who assumed the post of sojaban (an official in charge of the ceremonies) and guard of Fushimi-jo Castle.
山辺郡平等坊（現・天理市平等坊町）の山口氏は奏者番、伏見城番などを勤めた山口直友の裔である。