[1] The meaning of the name is "white phantom" (etymologically cognate with Gwenhwyfar, the original Welsh form of Guinevere).
Ultimately her beauty and charms serve as the driving force behind the deaths of hundreds of men, even compelling Fer Diad to fight Cú Chulainn, his beloved foster-brother and best friend, in the single combat which leads to his death by Cú Chulainn's Gáe Bulg.
Afterwards, Medb repeatedly offers her daughter to prospective warriors, first to Nad Crantail, then to Láríne Mac Nóis, in a truce with Cú Chulainn with the condition that he not attack her army by night in exchange for his provision each day with a warrior with whom to engage in one-on-one combat.
[6]: 100 Finnabair is subsequently offered to Fer Diad, "saying that he was her only darling, her chosen lover from among all the men in the world.
You might as well/try to tie sand with a rope.”[6]: 155 Her last and perhaps genuine love interest, Rochad Mac Faithemain, joined the forces of Ulster before the last great battle.