α. early Middle English parfornist (past participle), Middle English parfornysshe, Middle English parfournyshe, Middle English parfurnysshe, Middle English perfournesche (past participle, transmission error), Middle English perfournische, Middle English perfournys (northern), Middle English perfurnis (northern), Middle English perfurnysche, 1500s perfurnisshe, 1500s perfurnysch; Scottish pre-1700 perfornis, pre-1700 perfornyce, pre-1700 perfornys, pre-1700 perfurneis, pre-1700 perfurneise, pre-1700 perfurneiss, pre-1700 perfurnes, pre-1700 perfurnis, pre-1700 perfurnys, 1800s perfurnish (archaic); N.E.D. (1905) also records forms late Middle English parfurnyshe, late Middle English perfurnisshe.
β. late Middle English perfourmys (northern); Scottish pre-1700 perfurmeis, pre-1700 perfurmis.