[name]Harriet[/name] is an old, old favourite of mine. A frightening 22 years ago, I used it for my pet mouse (!), and am going to suggest it for the potential sister to my niece [name]Lorna[/name]. Not surprisingly, [name]Lucy[/name] and [name]Eleanor[/name] (see signature) would be my top choices, both making a lovely set.
My thoughts on the others:
[name]Georgia[/name] & [name]Eliza[/name] - nice names which fit with [name]Harriet[/name], but not as well as those above
[name]Katie[/name] - feels nicknamey next to [name]Harriet[/name]
[name]Evelyn[/name] - really hate this name, sorry can’t give objective view!
[name]Hannah[/name] - very similar style, but I’d probably avoid the double H’s
[name]Leah[/name], [name]Darcy[/name] & [name]Amy[/name] - feel very different in style, much more modern and trendy
[name]Charlotte[/name] - would avoid the repeated ‘ut’ endings