Gwilym an t-ainm as fheàrr a chiall: Sunndach, Fialaidh, Càirdeil, Comasach, Cruthachail. Faigh Gwilym brìgh ainm.
Gwilym a thàinig a 'chiad ainm. Welsh form of William. Faigh Gwilym a thàinig a 'chiad ainm.
Gwilym ainm diminutives: Gwil. Faigh Far airson Gwilym.
Samhlachadh ainmean Gwilym ann an diofar dhùthchannan agus cànanan: Bill, Billie, Billy, Guglielmo, Guilherme, Guillaume, Guillem, Guillermo, Gwilherm, 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 Gwilym ann an cànanan eile.
As ainm cumanta sloinnidhean le Gwilym: Williams, Panah-williams, Panah. Faigh Liosta de na sloinnidhean ainm le Gwilym.
As ainmean cumanta le ainm mu dheireadh Fitzen: Marcy, Son, Juan, Pattie, Elwood. Faigh Ainmean a 'dol le Fitzen.