From your top contenders, really like [name_f]Harriet[/name_f], [name_f]Iris[/name_f], [name_f]Jane[/name_f], [name_f]Cecily[/name_f] and [name_f]Pippa[/name_f].
From your other names, I like [name_f]Poppy[/name_f] and [name_f]Posie[/name_f], but [name_f]Genevieve[/name_f] and [name_f]Margaret[/name_f] are nice too.
Ones I’d discount from your top contenders -
[name_f]Philippa[/name_f] & [name_f]Pippa[/name_f] - Although I love the sound and look of [name_f]Pippa[/name_f], the unsavoury meaning in several European countries would prevent me from using. I’d like to think of my children as travellers and world citizens, so something that raises sniggers on the continent would definitely be enough to rule it out as my one perfect name.
[name_f]Iris[/name_f] - too popular
[name_f]Ismay[/name_f] - reminds me of dismay
[name_f]Polly[/name_f] - reminds me of plastics
… which leaves [name_f]Harriet[/name_f], [name_f]Jane[/name_f] and [name_f]Cecily[/name_f] from your top contenders.
From my faves of your other names, I’d rule out [name_f]Poppy[/name_f] as a first based on popularity, and while I adore [name_f]Posie[/name_f] I feel it’s a bit too juvenile to be perfect. [name_f]Genevieve[/name_f] and [name_f]Margaret[/name_f] I’d probably only use as middles. [name_f]Genevieve[/name_f] is lovely but the fact that as a first it would likely get shortened to the far less sparkly [name_f]Jen[/name_f] or [name_f]Jenny[/name_f] would put me off. [name_f]Margaret[/name_f] is a little too patrician to use as a first imo.
So back to [name_f]Harriet[/name_f], [name_f]Jane[/name_f] and [name_f]Cecily[/name_f].
I’d rule out [name_f]Cecily[/name_f] based on the unappealing meaning. I love it, but this is one drawback that helps with the elimination process.
Of [name_f]Harriet[/name_f] and [name_f]Jane[/name_f], I feel [name_f]Jane[/name_f] takes it. It’s sleek, simple, and refreshingly different these days. I love that it’s so familiar yet so underrused. It would fit any personality and all ages. A [name_f]Jane[/name_f] would stand out a mile among all the ubiquitous frillier options such as [name_f]Amelia[/name_f], [name_f]Olivia[/name_f], [name_f]Isabella[/name_f], [name_f]Sophia[/name_f], [name_f]Lily[/name_f], [name_f]Mia[/name_f] etc, and it’s one of your honours. It actually feels quite bold against the current trends, despite being super common historically.
Not sure if you’re looking for middles, but [name_f]Jane[/name_f] [name_f]Harriet[/name_f], [name_f]Jane[/name_f] [name_f]Cecily[/name_f] (I’d be less bothered about the unappealing meaning in the middle position) or [name_f]Jane[/name_f] [name_f]Genevieve[/name_f] are all lovely.