See, to me, [name]Emily[/name] is a classic. It has only briefly ever dipped below the top 200. It did hit a burst of particular popularity around when you were born, but, if you look at its chart since 1880, it’s pretty consistent over long stretches of time. This is not to be a slave to charts: I have known grandma Emilys and baby Emilys. I do know a cluster in their 20s, so I sense the trendiness, but it’s less pronounced than with some other names with the same 20s-heavy effect.
Nonethless, let’s turn to your list.
[name]Eloise[/name] and [name]Fiona[/name], to me, are rather trendy…but not in a way that I think you shouldn’t consider them. Not in a made-up or overly modern way: they are grounded, historical/literary, and beautiful names. Nonetheless, I know a toddler [name]Fiona[/name] and no one else: I see it discussed (and used) on name boards. Same with [name]Eloise[/name]. If you look at the charts. [name]Fiona[/name] just emerged in the 1990s - [name]Eloise[/name] is in fact an older name in terms of top 1000 use, but completely fell from grace for a while.
Of course, that might not be so bad for you: you might end up “dated”, but to an age 20 years younger than yourself : D.
[name]Gwendolen[/name] (this spelling) has never been in the top 1000, I know young and old Gwens of various longer names (or not), [name]Gwendolyn[/name] (this spelling) has always been in the top 1000, varying between 900 and about 100. it’s recovering a bit from its second recent low point, but I have a hard time imagining it climbing super high soon - even if it did, it seems like that wouldn’t be the first time around it did so. I think you’re pretty set with either spelling of this name.
[name]Persephone[/name] and [name]Livana[/name] are lovely and so odd as to be timeless in a sense currently - although the nn [name]Liv[/name] for [name]Livana[/name] will be mildly associated with the recent [name]Olivia[/name] rise (but [name]Olivia[/name] to me is a lot like [name]Emily[/name]).
I have a list called “stable not too popular” that I think might be a good place for what you’re going for, on the more conservative end of naming taste though. These are names that have always been in the top 1000, but, to my eye, have never had some incredibly wild swing upward or been too high up (although some have had some kinds of swings, and some might be too high up for your taste):
https://nameberry.com/userlist/view/25717
I think all of your names are attractive, so go with one if you’re ready, but hope that list is useful if not!
[name]Just[/name] like [name]Cordelia[/name]). And you don’t hear it very often. I didn’t have access to databases and such when I named her but I’ve always noticed peoples names and I’d never really met any Biancas…except in a movie or two. Most people agree it’s a nice name, but it’s underused. But now that I do have access to databases, I know it never goes anywhere near the top 20 in my state/country.