The surname Pacher shows a disputed origin, with two possible interpretations. On the one hand, E. Rossoni notes that it would derive from the German term packer, which designates a worker in charge of packing, which would indicate an occupational origin linked to the trade of the founding ancestor.

On the other hand, B. Zuanella proposes a toponymic origin, relating it with the German noun Bach ("stream"), with the suffix -er that indicates belonging, giving rise to an original form Bacher ("one who lives beside a stream"), later phonetically transformed into Pacher. In this way, the surname could reflect both a professional activity and a reference to the place of residence.