Possibly derived from the Old Breton name
Guerec, which may be related to Welsh
Gweir, the name of several of King
Arthur's warriors and relatives in early Welsh tales. This is borne by the hero of the Arthurian romantic poem
Erec and Enide by Chrétien de Troyes (completed c. 1170). This poem is thought to be the basis for the later Welsh story
Geraint and Enid in the Mabinogion.