Watten as in the card game and if it helps my mother taught me it and she is south Tyrolean.
I can only give a short answer as a start here but according to most of the books describing the card game (Max Hafele, Meinhard Eiter: Das Tiroler Watterbuch. Löwenzahn Verlag, 1999) Watten orginated most likely in the region covering South and North Tyrol and Bavaria during the Napoleonic wars of the early 19th century.