I love all of them (but then I think everything sounds better in French). Some come up in English as well or have variants, but I'll only list ones where I strongly prefer the French version. Some of my favourites are -
AgatheAgnesAmelieAurelieChantal ClaireColetteCosetteEulalieGaelle (love love love)
Genevieve (French pronunciation)
HeleneMaelysMireille (love love love)
Nathalie RegineSandrineSoleneTherese
AndreAnselmeAntoineAubinAugustinEtienneGaetanRemyThibaultXavier (French pronunciation)
I haven't got all the accents here, sorry!