Literary and dignified, with a hint of mythology for you:
[name]Cybele[/name]
[name]Diane[/name]
[name]Eirene[/name]
[name]Evadne[/name]
[name]Helene[/name]
[name]Ismene[/name]
[name]Lucine[/name]
[name]Maeve[/name]
[name]Melisande[/name]
[name]Rhiannon[/name]
[name]Ysolde[/name]
From a metrical perspective, I think [name]Ophelia[/name] (a 3-syllable word with the stress on the 2nd syllable) would flow well with a 2/3-syllable name with the stress on the second syllable, and preferentially one that does not start nor end with an -ah sound.
French names work well:
[name]Corinne[/name]
[name]Celeste[/name]
[name]Camille[/name]
[name]Cecile[/name]
[name]Sandrine[/name]
[name]Gisele[/name]
[name]Clarisse[/name]
[name]Colette[/name]
[name]Delphine[/name] (retains your watery theme :))
[name]Eliane[/name]
[name]Fabienne[/name]
[name]Josiane[/name]
[name]Louise[/name]
[name]Mireille[/name]
[name]Martine[/name]
[name]Roselle[/name]
[name]Simone[/name]
[name]Vivienne[/name]
I don’t think any of these are too odd, either. All flow well to my ear with [name]Ophelia[/name].