Well, I'd criticise any of these for being overused, but I suppose that goes without saying! On sound alone, I like:
EmilyOliviaIsabellaGraceSophiaMaya (This is a surprise, so high up in the list)
AbigailJessicaHailey (Not this spelling though; I like
Haylie and
Hayley)
ChloeJuliaLauren
EthanJoshuaNathanLiamJamesOwenLogan (prefer for a girl)
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♥
Elinor♥