Wikipedia
Welche
Welche is a Gallo-Romance dialect of Lorrain spoken in Bas-Rhin and Haut-Rhin in the western part of Alsace in France. The varieties of this dialect include those of Bruche, Villé, Lièpvre, Kaysersberg and of Orbey. Welche is a dialect without numeric strength.
Welche is the French spelling of Welsch, a German word given to foreigners (i.e. non-Germanic-speaking people), derived from the term Walha. The word has the same linguistic roots as "Welsh", but the Welche dialect is not at all similar to the Welsh language.