Gwilherm an t-ainm as fheàrr a chiall: Fialaidh, Sradagach, Càirdeil, Furachail, Droch. Faigh Gwilherm brìgh ainm.
Gwilherm a thàinig a 'chiad ainm. Breton form of William. Faigh Gwilherm a thàinig a 'chiad ainm.
Samhlachadh ainmean Gwilherm ann an diofar dhùthchannan agus cànanan: Bill, Billie, Billy, Guglielmo, Guilherme, Guillaume, Guillem, Guillermo, Gwil, 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. Faigh Gwilherm ann an cànanan eile.
As ainmean cumanta le ainm mu dheireadh Pelzel: William, Matt, Malorie, Kris, Emilie, Émilie, Emílie. Faigh Ainmean a 'dol le Pelzel.