I don't think any name is plain!
I like
Jane. It's so sweet and simple, and it'll suit any age. Also, I don't think nicknames should (or in this case, shouldn't) be planned. What if she wants to be called (by you and friends)
Janie? You're going to say "no"? Anyway, I suggest
Jane Meredith.
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Lissa Hannah-
As soon as tradition has come to be recognized as tradition, it is dead. - Allan Bloom