Gwillym uiga igoa sili: Gauai, Po nei, Foafoa, Volatile, Fiafia. Aumai Gwillym uiga o le suafa.
Gwillym amataga o le igoa muamua. Welsh form of William. Aumai Gwillym amataga o le igoa muamua.
Gwillym igoa diminutives: Gwil. Aumai Nicknames mo Gwillym.
Igoa tutusa mo Gwillym i atunuu ma gagana eseese: 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. Aumai Gwillym i isi gagana.
O le tele o igoa tutusa ai ma faaiu Saunderson: Liam, Roman, Velda, Tomika, Ray, Román. Aumai Igoa e aumai faatasi Saunderson.