Would you like it if you were called..

Blair. I would have loved a name like that.
Perdita is beautiful and am glad the pp loves her name, but I just think 'lost automatically ( which is weird because if I hear Lucy, I don't think Light, or Peter, I don't think rock.)
I don't really like the others. Blythe- no, because you'd be forever spelling it.
Robert is lovely.

Robert is very classic, so to me traditional Rosamund fits best with that style (and is my personal favourite of your choices, although I must admit I dislike the nn Roz).

I do have a soft spot for lovely Shakespearean Perdita but that feels "braver" somehow - as does classical Pandora. I do like virtue name Blythe as well (although I prefer it as a middle I think).

Less keen on the "fussy" sound of Petronella (prefer simple, international Petra) and Primrose is quite prissy imo, sorry (it's the "prim"). Blair stands out as very different to your other more classical choices imo - it's really not my taste.

Perdita.

Primrose makes me think of the dolly in My Naughty Little Sister ( Rosy-Primrose). I like it though. I absolutely love Perdita, and would love it as my own name, but it means 'lost' which would give me pause when naming a baby.

Rosamund is ok but I wouldn't like to be called any of the others, sorry.

Robert is great though.

Rosamund and Blythe are my favourites. Least favourite are Pandora (the bracelets) and Petronella. I have a great aunt Primrose but she has always been called “Pommie” - which seems a weird nickname to me, but guess it’s better than Primmy...

Would love to be a Rosamund - very classy and elegant.

No to the others.

Sorry missed Primrose... ok.

I love Rosamund.
Petronella . Is ok.
I'm not keen on Perdita for its meaning although I like the word iyswim.
Not keen on Pandora for meaning and bracelets.
No to the others.

I don’t mind Blair, although it does remind me of Tony. I wouldn’t really want to be called any of the others sorry OP

I like Blair and Blythe, not keen on the others, though I like Rose on its own, not as part of a longer name.

I would like Blythe or Primrose

Perdita, Rosamund and Blythe are all lovely.

I live Perdita. Fiery and strong!

Blair - a bit trendy. Don't think it'll date week. I'd assume they were beautiful cut very shallow and self-centred (unfair, I know).

Blythe - I'd assume they were a boy.

Primrose - pretty. Can easily be shortened to Rose if they don't like it. Not my type of name, but perfectly nice and not overused.

Rosamund - absolutely beautiful

Pandora - unfortunate connotation of a box

Perdita - pretty sounding, but I've known three and they were all incredibly vain and only interested in male attention

Petronella - I'd assume a smart background. Not to my taste but a perfectly nice name. Every Petronella I've ever met has been loudly-spoken, even louder-laughing, highly intelligent, confident, attractive and successful. Could be worse!

Robert is a great name and I wish I heard it more.

Blair ok but makes me think of the Blair witch project.
Blythe : ok not my cup of tea.
Primrose: pretty
Rosamund: no ugly.
Pandora: box no.
Perdita: I like, but nn Perdy could lead to Pervy and that could lead to bullying.
Petronella sounds like some bacteria based sickness bug.

What if it suffered some ethical scandal and that followed her around as everyone's association with her name?

The only one I like is Robert

My name is Perdita! I never see it mentioned in name lists, so this is quite exciting

Honestly, it's not a name I would have chosen - it feels quite hard to me and doesn't have the nicest meaning. Having said that, I love its links to Shakespeare and the fact that I've never met anyone else with the same name. I get lots of compliments on it. Perdy is a nice nn too

From your other suggestions, I like Rosamund, though prefer Rosa / Rosalie. Not keen on the others, though Primrose would make a nice middle name. Pandora has too much scope for teasing, though I like Dora as a nn - maybe Theodora?

I love Blaire but put an e on the end.

Blythe is a bit cold and harsh
Petronella no reminds me of that mozzie repellant citronella
Rosamund - ok, but the Mund is a bit harsh
Pandora - no
Perdita - no

I only like Rosamund. It's confident sounding and a teensy bit butch (much like myself). The others are all too twee / feminine and / or not clearly names (i.e. Blair).

Blair people would assume a boy bit there is value in unisex names
Also associated with tony
Blythe very old fashioned
Primrose most neutral of these names, any class
Rosamund not very pretty I prefer Rosalind
Pandora box/Adrian mole
Perdita the dog in 101 Dalmatians
Petronella too much like petrol

I quite like Blair

I went to school with a Purdey (that was her actual name though) - good nickname for Perdita (although I guess you’d spell it Perdi?)

I wouldn’t particularly like to be named any of these though to be honest.

At a push Blair