I like it, but I'd also only use it as a mn.
I like
Alice Guinevere,
Iris Guinevere, and
Guinevere Elanor.
Also
Anna Guinevere,
Isis Guinevere,
Guinevere Hera,
Guinevere Rose,
Guinevere Morgan,
Lyra Guinevere,
Guinevere Lilac,
Guinevere Shae,
Guinevere Marian,
Kyra Guinevere,
Guinevere Mairwen,
Elia Guinevere,
Guinevere Pascale,
Guinevere Rhian,
Guinevere Morwen,
Elspeth Guinevere,
Guinevere Branwen,
Opal Guinevere,
Selene Guinevere,
Cecily Guinevere, and
Fiera Guinevere.
Vera and
Ginny work as nn's. I also sort of like Guin.