What is "berrwiller"

Berrwiller (dialectal name: Barwillr; ) is a commune in the Haut-Rhin department in Alsace-Champagne-Ardenne-Lorraine in northeastern France. It forms part of the Mulhouse Alsace Agglomération, the inter-communal local government body for the Mulhouse conurbation. Its inhabitants are called the Berrwillerois and Berrwilleroises.