The article examines, from a linguistic and topographical point of view, the Herefordshire place-names Canon and King's Pyon (parishes) and Pyon Wood (in Aymestrey parish) and suggests that they enshrine a hill-name to be compared with those in puy and its cognates (from Latin podium) in southern France and neighbouring countries. A Primitive Welsh form /peið'jon/ meaning 'conical hill' from Latin podium with an n-suffix, is proposed as the ancestral form of the name Pyon. Also examined are Old English place-names which appear to contain an element *peon, which may have had the same origin as the Herefordshire Pyon-names.