[Facts] Re: Johanneta & Parretta & Vuillerma (medieval swiss female names)
Vuillerma must derive from Wilhelm (the German form of William) but there is something to explain. The initial Vui- instead of standard French Gui- must be traced to the local dialect (Franko-Provençal), and the "r" in the place of the last "l" is explained by dissimilation.