Gwilym kacha mma aha pụtara: Eji obi ụtọ, Emesapụ aka, Enyi na enyi, Eru, Okike. Nweta Gwilym pụtara aha.
Gwilym si malite aha mbụ. Welsh form of William. Nweta Gwilym si malite aha mbụ.
Gwilym aha diminutives: Gwil. Nweta Nicknames maka Gwilym.
Agakọta aha maka Gwilym na mba dị iche iche na-asụ asụsụ: 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. Nweta Gwilym na ndị ọzọ asụsụ.
Kasị nkịtị surnames na aha Gwilym: Williams, Panah, Panah-williams. Nweta List of surnames na aha Gwilym.
Kasị nkịtị aha na aha ikpeazụ Rickett: Jeanice, Ayanna, Wade, Venus, Colton. Nweta Aha na-aga na Rickett.