Montagna Asal. Means "mountain" in Italian. Meunang Montagna Asal.
Ngaran sinonim pikeun Guillem di béda nagara jeung basa: Bill, Billie, Billy, Guglielmo, Guilherme, Guillaume, Guillermo, Gwil, Gwilherm, Gwilim, Gwillym, Gwilym, Illiam, Jami, Jelle, Liam, Pim, Uilleag, Uilleam, Uilliam, Ulick, Vilĉjo, Vilém, Vilhelm, Vilhelmas, Vilhelmi, Vilhelmo, Vilhelms, Vilhjálmur, Vilho, Vili, Viliam, Vilim, Vilis, Viljami, Viljem, Viljo, Vilko, Ville, Villem, Vilmos, Wil, Wilhelm, Wilhelmus, Wilkin, Wilky, Will, Willahelm, Willem, Willi, William, Willie, Willy, Wilmot, Wim, Wiremu, Wöllem, Wullem, Wum. Meunang Guillem dina basa séjén.
Paling ngaran umum kalawan ngaran tukang Montagna: Giovanna, Monica, Domenic, Guy, William, Mónica, Mònica, Mônica. Meunang Ngaran anu buka kalayan Montagna.