From the Norman French form of the Welsh name
Gwenhwyfar meaning
"white phantom", ultimately from the old Celtic roots *
windos meaning "white" (modern Welsh
gwen) and *
sēbros meaning "phantom, magical being"
[1]. In Arthurian legend she was the beautiful wife of King
Arthur. According to the 12th-century chronicler Geoffrey of Monmouth, she was seduced by
Mordred before the battle of Camlann, which led to the deaths of both Mordred and Arthur. According to the 12th-century French poet Chrétien de Troyes, she engaged in an adulterous affair with Sir
Lancelot.
The Cornish form of this name, Jennifer, has become popular in the English-speaking world.