Elegant lies in the eye of the beholder but I will give it a shot:
Alexander/Alexandria
AugustBeatriceByronCatherineCelesteCatarinaChandlerDominic/Dominique
DonovanDouglasEdwardFrederick/Frederique
Genovieve
GwenethHannahHunterHaydenIsabellaIvanJacindaJamesLaurenMarguriete
MarshallMoniqueNadiaNicolasOliverOpheliaPalomaParkerPerryQuentinRyanRebeccaRichardRowanSofia/Sophia
TamaraTheodoreUrsulaVincentVivica
WilliamWadeWesleyXavierYvonne
I may have included some you mentioned. All those I agree with. However, not everything here is something I would use, personally.