Gwenhwyfar, the swelling white wave, is in curious correspondence with two other Welsh names, namely, Gwenfrewi, the white stream, and Dwynwen, the white wave.  Mr. Davies makes her the lady of the summit of the water, and wants us to see in her another variety of the ark; but setting this aside, the ocean names of the Britons are worth noting, when we remember that they also had Llyr, with Bronwen and Creirdydlidd, all certainly mythical.
    Without consigning Queen Gwenhwyfar to the regions of Regan, it is likely that hers was a hereditary name descended from some part of the ancient faith.  A Welsh couplet describes her as—"Gwenhwyfar, daughter of Gogyrvan the Great, / Bad when little, worse when great."
    And the various early tales in the Mabinogion, as well as the metrical romances, always give the same character of the beautiful queen of light conduct. (History of Christian Names, Yonge, 1884)