Geshi/Gesu (lower ranked officer) were named, distinct from the lord of the manor, as Joshi (Geshi's superior), and the name of Kumon was derived from their role, which was management of books and records.
なお、下司とは、上位の荘園領主を上司と見たときの対比から生まれた呼称であり、また公文は、荘園管理のための帳簿や文書を扱うことから来た呼称である。