Hey Shealah,
I’d have to say my favourites from your list are [name]Isabeau[/name] and [name]Sophia[/name]. As for three combos I would use if only able to use names from your list: [name]Isabeau[/name] [name]Lily[/name], [name]Sophia[/name] [name]Gwendolyn[/name] & [name]Eliana[/name] [name]Charlotte[/name]. If I was only to make up one combo with these names though, it would be [name]Isabeau[/name] [name]Sophia[/name].
I think that [name]Josephine[/name], [name]Charlotte[/name] and [name]Gwendolyn[/name], or even [name]Sarah[/name] are names of the same genre and nice together, all as first names. I think that [name]Sophia[/name] and [name]Emma[/name] are too common. I also like to leave classic names “alone” rather than change the spelling or make them into something different, as in [name]Isabeau[/name] (unless you really like it and want it as a middle name).
Personally, I can’t choose. I like about six equally, although I wouldn’t use them all for sisters, as there are some repeats.
[name]Charlotte[/name] [name]Ashley[/name] [name]Sophia[/name] “[name]Lola[/name]/[name]Lottie[/name]”
[name]Lily[/name] [name]Josephine[/name] [name]Zola[/name] (although I would love to see [name]Lily[/name] [name]Josephine[/name] [name]Kate[/name]!)
[name]Josephine[/name] [name]Lily[/name] [name]Eliana[/name] “[name]Posy[/name]”
[name]Daphne[/name] [name]Emma[/name] [name]Jade[/name] (although I would like [name]Daphne[/name] [name]Emma[/name] [name]Jane[/name] much more)
[name]Gwendolyn[/name] [name]Emma[/name] [name]Joy[/name] “[name]Winnie[/name]” (so literary! I love it!)
[name]Hannah[/name] [name]Charlotte[/name] [name]Mariah[/name] (although I would like [name]Hannah[/name] [name]Charlotte[/name] [name]Maria[/name] more) “[name]Annie[/name]”