 As for the prefix, this might have been a Germanic given name, "Weldicho".Religious development in Welchweiler unfolded in step with the ecclesiastical history of the "Remigiusland", the County of Veldenz and the Duchy of Palatinate-Zweibrücken, that is with conversion at the time of the Reformation in 1545 and a further conversion to Calvinism in 1588.To this day, the population is overwhelmingly Evangelical.