Gwilym uiga igoa sili: Fiafia, Agalelei, Faauo, Agavaa, Foafoa. Aumai Gwilym uiga o le suafa.
Romig uiga faaiu sili: Lē ma vāloia, Po nei, Agavaa, Gauai, Foafoa. Aumai Romig uiga o faaiu.
Gwilym amataga o le igoa muamua. Welsh form of William. Aumai Gwilym amataga o le igoa muamua.
Gwilym igoa diminutives: Gwil. Aumai Nicknames mo Gwilym.
Igoa tutusa mo Gwilym 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 Gwilym i isi gagana.
Surnames taatele ma igoa Gwilym: Williams, Panah-williams, Panah. Aumai Lisi o surnames ma igoa Gwilym.
O le tele o igoa tutusa ai ma faaiu Romig: Rosario, Cathey, Johnathan, Cassi, Jasper, Rosário. Aumai Igoa e aumai faatasi Romig.
Ogatasi o Gwilym ma Romig o 78%. Aumai Ogatasi o Gwilym ma Romig.