Edited
I voted for [name_f]Andromeda[/name_f], but [name_f]Constance[/name_f] was a close second. 
I know you’re not too fussed about a matching sibset, but to me Georgia really feels like the odd one out. It doesn’t fit in with the vibe of any of your other children’s names, whereas Constance and Andromeda both tie in somewhere.
How about Constance Andromeda or Andromeda Constance? That way you use two of your three options 
Andromeda really completes the sibset, has loads of nickname options (Anna, Annie, Andy, Millie, Romy, Eda, Edie…) if she decides it’s too much of a mouthful later, and yet is really beautiful and intriguing as a whole.
Nessa is just too adorable, and though I find Constance a bit austere it’s a solid, timeless name with loads of history, still very much in use in France (I know a couple). Nessa fits your other children’s names almost better than Constance itself, but why not…
I’m also finding it difficult to pick between those two! I don’t think you can really go wrong though both would work. Maybe take both with you to the hospital and see which feels the best when the time comes?
Edited for privacy.
I vote for [name_f]Andromeda[/name_f] [name_f]Constance[/name_f] Georgiane! I think [name_f]Andromeda[/name_f] is the most interesting/nn-full/wildly romantic first name choice of those three by a mile. I think your other kiddos names have a timeless/off-the-beaten-path/dramatic vibe, and if you can go for [name_f]Andromeda[/name_f] I would be daring and do it! I think your pregnancy has been dramatic and so should your little ones name. [name_f]Georgia[/name_f] seems a bit too ‘commonplace/happens to be in style right now’, but is by far my second choice - I like the English Garden feel you mention and it’s a sweet name but a bit feisty, too, which seems fitting! [name_f]Constance[/name_f] does not ring any naming bells for me - sorry. I do like the nn [name_f]Nessa[/name_f], though, but [name_f]Nessa[/name_f] [name_f]Rose[/name_f] seems [name_m]OTT[/name_m] Wicked for me, I’m afraid. Good luck with your final choice! Can’t wait to see a little picture of her:)
Another vote for [name_f]Andromeda[/name_f], because I just cannot vote against the mythological princess and constellation. 
I voted for [name_f]Constance[/name_f]! I think it’s a great name, familiar, classic and underused which is like the jackpot of names haha. I [name_f]ADORE[/name_f] [name_f]Nessa[/name_f] as a nickname. It’s not the most intuitive but I can see it. I like your other choices but this is my favorite by far Any way you slice it you will have one awesomely named little lady!
I like them all but I voted [name_f]Georgia[/name_f]. Then I saw your sibset and I wish I’d voted [name_f]Andromeda[/name_f]! [name_f]Georgia[/name_f] feels too safe and average almost with siblings including Z e p h a n, P e r e g r i n e and D u l c i n e a. [name_f]Constance[/name_f] and [name_f]Andromeda[/name_f] are lovely, they have loads of nn potential and would be perfect with their siblings names.
[name_f]Constance[/name_f] [name_f]Andromeda[/name_f] please! I can’t believe you actually made it to three choices you both agree on, well done, epic namer.
I prefer [name_f]Andromeda[/name_f] [name_f]Constance[/name_f].
I vote [name_f]Andromeda[/name_f]! Though if you do decide on [name_f]Georgia[/name_f] (which is lovely) Have you thought about [name_f]Georgia[/name_f] [name_f]Constance[/name_f]? I think the two names sound beautiful together!
To be honest, I don’t think you are going to have much look with a winner looking at the poll… Your names are so lovely but very different. My friend had real difficulty picking her baby’s name… She decided to just wait and see her… You might just have to do that. I know that is not what you want to do but I think you will know if she is a [name_f]Georgia[/name_f] or an [name_f]Constance[/name_f] when the big day arrives xxx
[name_f]Andromeda[/name_f] is such a stunning rarely used name with a great history behind it. I would love to meet an [name_f]Andromeda[/name_f]. I’m not a fan of the other two.
I voted for [name_f]Constance[/name_f]. I like the vintage feel of it, I like that it feels grand but still down-to-earth. I think it fits beautifully with the more classic names like E ve and P eregrine but also the more unusual ones like Z ephan and D ulcinea. The only thing that I don’t like about [name_f]Constance[/name_f] is the nn [name_u]Connie[/name_u], I think you’d have to call her [name_f]Nessa[/name_f] from the get go, so that nobody gets the chance to call her [name_u]Connie[/name_u] (unless you don’t care, obviously).
Next is [name_f]Georgia[/name_f]. It does feel southern and sweet to me, and therefore works really well with D aisy and E ve, even C aspian sounds really lovely next to it. The other two do feel a bit out of place but with so many styles used in a sibset already, I think that’s hardly avoidable.
[name_f]Andromeda[/name_f] is too grand for me next to the rest, I can see it working with Z ephan and D ulcinea but even next to those two, which have a sweet, down-to-earth feel to them, it just feels like to much of a name to me.
I surprised myself by voting [name_f]Constance[/name_f]. It’s not a typical choice for me, that would’ve been [name_f]Georgia[/name_f]. But to me, it sounds like [name_f]Constance[/name_f] has your heart and she sounds best with her siblings.
[name_f]Andromeda[/name_f] is not only back on the table, but he’s agreed on it and it’s made the top 3!? [name_f]ANDROMEDA[/name_f] for the win! I think she’s gorgeous, and while [name_f]Georgia[/name_f] & [name_f]Constance[/name_f] are nice, I don’t think they have ‘spark’, but [name_f]Andromeda[/name_f] certainly does!
(If Blythe’s still a contender for middle, I’d still love to see Andromeda Blythe, however) Andromeda Constance would make for a lovely name, with all you want a name to be, in one combo.
[name_f]Georgia[/name_f], [name_f]Georgia[/name_f], [name_f]Georgia[/name_f]! I, too, don’t get the [name_f]Georgiana[/name_f] comments from your husband ([name_f]Georgiana[/name_f] is flawless!!!), but c’est la vie, I suppose! I was blown away by the comments that [name_f]Georgia[/name_f] doesn’t seem to fit, because, to me, [name_f]Georgia[/name_f] fits [name_m]WAY[/name_m] better than the other two! E.ve, Da!sy, and [name_m]Georg[/name_m]!a seems perfect. Casp!an and [name_f]Georgia[/name_f], Peregr!ne/P!pp!n and [name_f]Georgia[/name_f], Zeph@n and [name_f]Georgia[/name_f], Ev.e and [name_f]Georgia[/name_f]… It just seems perfect! I don’t really get how it couldn’t be the perfect fit, and I guess hearing you talk about how [name_f]Georgiana[/name_f] was your first inclination with this baby makes [name_f]Georgia[/name_f] just feel right. I don’t know. I haven’t been following as closely as some of the others, but [name_f]Georgia[/name_f] just seems like perfection to me. [name_f]Constance[/name_f] would probably be my second choice, just because [name_f]Nessa[/name_f] is adorable and I love -essa names, and [name_f]Constance[/name_f] is so meaningful to you. I don’t really “get” [name_f]Nessa[/name_f] for [name_f]Constance[/name_f], but I didn’t really “get” Da!sy for [name_f]Dulcine[/name_f]@, either, at first.
And man! Down to the wire. I was wondering how long naming this one would take–have you ever taken a list to the hospital and decided there? I can’t wait to see what you decide! For what it’s worth, I would love to see you go with [name_f]Georgia[/name_f] [name_f]Zelda[/name_f] [name_f]Constance[/name_f], but I haven’t seen as to whether [name_f]Zelda[/name_f]/Iselda’s still in the running? If you’re considering [name_f]Blythe[/name_f] as a MN, too, I think [name_f]Georgia[/name_f] [name_f]Constance[/name_f] [name_f]Blythe[/name_f] would be really sweet, too, even with the double virtue middles.
Good luck!
I voted for [name_f]Georgia[/name_f], but [name_f]Constance[/name_f] is a close second. [name_f]Georgia[/name_f] is just a name that works well for a girl or woman of any age; it has history and is fairly easily understood and spelled, yet it is a rare-ish gem. All the names work well with your other kids, so I wouldn’t fuss too much about that. [name_f]Andromeda[/name_f] for me is just a bit too much; although I like the idea of it a lot, I’m not sure I would actually want to wear it. No matter what, you can’t lose!
I feel like a few of your names have British vibes that [name_f]Constance[/name_f] & [name_f]Georgia[/name_f] work with. [name_f]Andromeda[/name_f] is AWESOME but so sci-fi & feels kind of like the odd name out. [name_f]Georgia[/name_f] is sweet but feels a little trendy to me.
I can’t believe I’m saying this because I had high hopes for so many of the other names on your list, but in all honesty I think you should go with [name_f]Constance[/name_f]. You love it, I think you should just do it. [name_f]Nessa[/name_f] helps it find some quirky balance & I think it works with your set.
[name_f]Constance[/name_f] [name_f]Rose[/name_f] nn [name_f]Nessa[/name_f]. - and perhaps throw a playful name in as a first middle to keep things spicy.
[name_f]Andromeda[/name_f], oh [name_f]Andromeda[/name_f]! For all the wonderful nicknames. Think of being able, as you grow up, to be a plain [name_f]Ann[/name_f] or spunky [name_f]Andi[/name_f] or slightly mysterious [name_u]Romy[/name_u]. It’s just all goodness right there.