Another potential place of origin for Prié blanc is the Valais region of Switzerland where the grape seems to have grandparent relationship to the Swiss wine grape Rouge du Pays through Prié blanc's offspring Mayolet. In Switzerland, one of Prié blanc's primary synonyms is Bernarde which maybe a reference to the Great St Bernard Pass connecting the Valle d'Aosta to Valais which would likely be the path that cuttings of the grapevine would spread from one region to the other. However, ampelographers like Swiss grape geneticist José Vouillamoz believe that it is far more likely that Prié blanc spread from Aosta to Switzerland than the other way around.