I would not do
Evie as a nickname for
Guinevere; it feels uncommonly contrived, and this comes from someone who fell in love with Evening solely to give Evey a full name. ^^; (I like it for many more reasons now, but at the beginning of our affair, the main reason I grabbed onto it was "I can't do Eve/Evelyn/Eveline/etc, but I have to have some way to make note of Evey
Hammond, who has taken over my brain, and damn everyone else for liking her name, too." Lulz.)
Personally, I think that
Winnie is the cutest possible nickname for Guinnevere (the spelling I prefer--blame a certain supergroup). That seems less forced to me because it has some precedence; in
The Wonder Years,
Winnie Cooper's full name was
Gwendolyn, and what's good for a
Gwen name is good for a Guin name, IMO. On the other hand, with Evie...well, it's getting
very popular, and
Guinevere "
Evie" loses all cute points by sounding as though the parents decided they wanted both the nickname of the moment and something really unusual that would set their baby apart.
Guinevere and
Seraphina sound fine together, but they're not two I'd choose. To me, their length starts to sound a bit overwrought and pretentious when they sit next to each other. But on the other hand, I am instinctively drawn to short names--to stuff that is so countrified and unpretentious that it might even manage to go the whole way 'round and end up pretentious again. So that's a personal aesthetic thing. I'm sure they'd work out fine; I just would prefer they were Guinnevere and
Serafina, and would like them best if one or both was a middle name. ;)
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