Ursch

From my mother's side Iam Ursch .My grand'father was born In Algeria . From my grand -grand'father I know that we are from Drusenheim in alsace, a small city on the river Rhein, we can say on the opposite site of Baden-Baden on the german side .
Can you tell me where that name Ursch comes from . Iknow that you can find Ursch's families in Germany Austria Italy and even in the States .
Thank you if you can give me some more informations ,but please in english because I don't understand or speak any german.