Jennifer

Jennifer is actually a distant cousin of Guinevere. The name Guinevere was spelled in a variety of ways (Guenevere, Guenever, Gwenivar). The Cornish form Gwennever was eventually adopted into English as Jennifer. The meaning of the name varies, though. It's quite common as a name which is probably the downside but if you look at it another way at least it sounds better compared to many other popular, trendy names. So in this case you would rather go for a common name instead of those tacky popular or trendy names.

If it was originally a Cornish name, why is it not also listed as Cornish?

In Welsh Jennifer means white-cheeked. I've also seen it used as fair in combination with beautiful, prsoperous or fertile. It's also said that a Jennifer has deep emotions, a bright mind and will do aything to reach her goal.

If it is according to Welsh Mythology then Gwener is the Welsh word for the planet Venus.
Gwener [m.] (n.) Venus
or even
gwe+n [gwenau, f.] (n.) smile, grin.

Hello all, as far as I know the name means as much as "white spirit", "bright spirit" or, as a free translation, "good spirit". It derives from the Arabic "djinn" meaning "ghost" and "fer" for "white".

Jennifer means pure, white wave or if it is spelled Jennipher then it means pure, white ghost.