Obviously there are loads, but the ones that spring to mind tend to be more of the 'classic' / traditional type, or they just seem a bit dull. Examples:
Elizabeth
Margaret
Judith
Helen
Louise
Jane
Etc.
I'm looking for something which sounds pretty and a bit more modern - maybe ones which could be described as a little trendy, but not too 'out there' e.g.
Iris
Seren
Fern
Erin
Scarlett
Rose
Imogen
Etc.
Any other ideas?