The names Wasgau and Vosges have the same linguistic source: the originally Celtic hill and forest god, Vosegus, who was adopted by the Romans who incorporated it into their Latin names for the region, Vosegus mons (Vosegus Hill) and Silva Vosegus (Vosegus Wood). This name became the French Vosges, and the Middle High German Wasigen, which further evolved into Wasgau and Wasgenwald (Wasgen Forest). Linguistically these terms are also related to the Vôge region which is adjacent to the Vosges to the southwest, whose name derives from the feminine form *Vosagia.