So we are still generating our list:
Here is what we have so far:
[name_f]Agnes[/name_f] nn [name_f]Aggie[/name_f]
[name_f]Rosemary[/name_f] nn [name_u]Romy[/name_u]
[name_f]Gwendolyn[/name_f] nn [name_f]Winnie[/name_f]
[name_f]Scarlett[/name_f] nn [name_u]Scout[/name_u] or [name_f]Lettie[/name_f]
[name_f]Rosemary[/name_f] nn [name_u]Romy[/name_u]
[name_f]Louisa[/name_f] nn [name_f]Lulu[/name_f], [name_u]Lou[/name_u]
Thoughts!!!
[name_f]Love[/name_f] all of these names! I think my favourites (especially with [name_f]Sylvia[/name_f] and [name_f]Josephine[/name_f]) would have to be [name_f]Gwendolyn[/name_f] and [name_f]Rosemary[/name_f]. They’re just gorgeous! Have you considered [name_f]Rosamund[/name_f], too? I love that with your sibset.
You can’t go wrong with any of this! They’re all stunning. Best of luck!
With [name_f]Sylvia[/name_f] and [name_f]Josephine[/name_f] I like - [name_f]Rosemary[/name_f], [name_f]Gwendolyn[/name_f], and [name_f]Louisa[/name_f].
[name_f]Rosemary[/name_f] nn [name_u]Romy[/name_u] is the winner!
1 [name_f]Rosemary[/name_f] nn [name_u]Romy[/name_u] - the long form is so pretty and the nickname is just too darn cute to pass up!
2 [name_f]Louisa[/name_f] nn [name_f]Lulu[/name_f] - I love the literary pedigree
3 [name_f]Gwendolyn[/name_f] nn [name_f]Winnie[/name_f] - not a favourite of mine but it does “fit” with [name_f]Sylvia[/name_f] and [name_f]Josephine[/name_f]
[name_f]Agnes[/name_f] is too heavy with your girls and [name_f]Scarlett[/name_f] just doesn’t have the vintage charm.
P.S. [name_m]Just[/name_m] letting you know that you need to fix your daughter’s name in your signature. It currently reads Sylivia instead of [name_f]Sylvia[/name_f]. 
You’ve got great options! I don’t care for [name_f]Agnes[/name_f] and think it’s the ugly duckling next to [name_f]Sylvia[/name_f] and [name_f]Josephine[/name_f] (although [name_f]Aggie[/name_f] is super cute). [name_f]Scarlett[/name_f] doesn’t seem to be the same style, although again the nn [name_u]Scout[/name_u] is adorable. [name_f]Rosemary[/name_f] nn [name_u]Romy[/name_u] is probably my favorite, then [name_f]Gwendolyn[/name_f], then [name_f]Louisa[/name_f]. You really can’t go wrong with this list!
Thank you all! (Oops about the signature thanks for noticing)
I think [name_f]Rosemary[/name_f] and [name_f]Louisa[/name_f] are our two favs right now. Especially since [name_f]Louisa[/name_f] was my grandmothers name. We have both also loved [name_f]Rosemary[/name_f] for a long time. When we found the nn [name_u]Romy[/name_u] is skyrocketed it to the top. I really do appreciate the feedback.
[name_f]Rosemary[/name_f] is perfect. You don’t hear that one very often, even here on Nameberry.
Crushing on your sibset. [name_f]Rosemary[/name_f] might very well become my one that got away (close second to [name_f]Rowena[/name_f]), so I’m absolutely delighted to see someone else considering it, especially with [name_u]Romy[/name_u] – my favorite nickname, ever. [name_f]Louisa[/name_f] is so pretty too, though.
I agree that [name_f]Agnes[/name_f] is the odd one out; I feel like it has a rather harsh sound compared to the others. The Welsh (somewhat nickname-y) version might work, though. It’s the lovely [name_f]Nesta[/name_f].
Then my vote is for [name_f]Louisa[/name_f] if it was your grandmothers name. I think that would be a lovely thing to do assuming you loved yours as much as I loved mine!
[name_f]Agnes[/name_f] nn [name_f]Aggie[/name_f] - Not my style, but cute. I prefer nickname Ness to [name_f]Aggie[/name_f].
[name_f]Rosemary[/name_f] nn [name_u]Romy[/name_u] - I love [name_u]Romy[/name_u]! [name_f]Rosemary[/name_f] always felt a little stiff to me.
[name_f]Gwendolyn[/name_f] nn [name_f]Winnie[/name_f] - [name_f]Lovely[/name_f].
[name_f]Scarlett[/name_f] nn [name_u]Scout[/name_u] or [name_f]Lettie[/name_f] - I adore [name_u]Scout[/name_u] as a standalone! I never cared for the Gone With the Wind belle, but [name_u]Scout[/name_u] is adorable.
[name_f]Louisa[/name_f] nn [name_f]Lulu[/name_f], [name_u]Lou[/name_u] - Not my favorite, but I love [name_f]May[/name_f] and [name_u]Alcott[/name_u] (for a boy).
[name_u]Romy[/name_u] is so cute! [name_f]Rosemary[/name_f] isn’t really my style, but it does make a good full name for nn [name_u]Romy[/name_u]. My vote goes to [name_f]Rosemary[/name_f]!
Any middle names come to mind for your favorites?
[name_f]Agnes[/name_f] nn [name_f]Aggie[/name_f] for sure. I’m seriously in love with the name [name_f]Agnes[/name_f]; it has so much charater associated with it, it’s not popular and has a super cute nickname. It also goes great with your girls’ names.
Thanks everyone for the feedback! It is nice to hear
I like [name_f]Rosemary[/name_f] and [name_f]Scarlett[/name_f] best.
I think [name_f]Rosemary[/name_f] and [name_f]Louisa[/name_f] would be lovely with your sibset
Edited for privacy.
[name_f]Rosemary[/name_f]! The name is pure magic to my ears and fits wonderfully with the rest of the sibset.