Again I just want some opinions!
Biggest question!
I have a sister that is named [name_f]Chloe[/name_f]. Is it too close?
How would you do the e? [name_u]Zoë[/name_u], [name_f]Zoé[/name_f], Zoè? [name_u]Or[/name_u] something else?
Is it too popular?
Zoe and [name_f]Chloe[/name_f] are pretty similar, so I think it depends on how often they’d be around together. For example, if you call “[name_f]Zoe[/name_f], come to the kitchen!”, [name_f]Chloe[/name_f] might mishear it as her name and that would be confusing. But if they don’t see each other often, it wouldn’t be an issue.
I would just do [name_f]Zoe[/name_f] with no accents, but my second choice would be [name_u]Zoë[/name_u]. I don’t think it’s too popular.
I hope to be close with my sister, but it wouldn’t be too often that they’d be together, considering where we live.
I just want something that makes the name a little more interesting, but if it leads to problems in the future with spelling then obviously I’m not going to do that.
Zoe is beautiful. I think it could work with [name_f]Chloe[/name_f] -kind of like a nod to her
This is my S/O’s all-time favourite name for a girl. I don’t mind it, but I don’t think it’s my favourite? He prefers the [name_f]Zoey[/name_f] spelling 
If you’re going with [name_f]Zoe[/name_f] though, I wouldn’t add an accent to the E, personally, as it would likely cause confusion more than anything, especially since in some places, documents don’t allow for them?
It is close to [name_f]Chloe[/name_f], but I don’t think it’d be a huge issue? I personally have met a lot of [name_f]Zoe[/name_f]/Zoeys, but it’s still a nice name. I think my area’s a bit of an odd one though!
I have always love loved [name_f]Zoe[/name_f]!
Zoe is simple, sweet, and spunky! It’s definitely similar to [name_f]Chloe[/name_f]; if this were a question of sisters, I’d say they’re much too close. But I think for an aunt and niece it wouldn’t be a big deal. In terms of spelling, I would go for just [name_f]Zoe[/name_f] personally, without any accent marks or umlaut. That’s just my personal preference, though! Combining spellings, [name_f]Zoe[/name_f]/Zoey/Zoie would be in the U.S. top 10 numbers-wise, and I do know quite a few Zoes personally. This is something that could very a lot regionally, though. I wouldn’t let the popularity stop you if it’s your favorite!
Zoe is a lovely choice! I’ve only met one [name_u]Zoë[/name_u] in my life.
I definitely don’t think it’s too similar to aunt [name_f]Chloe[/name_f]. Assuming you get on well with your sister, I think the similar sounds are actually something that could be quite bonding for them! As another commenter said, for sisters it would be a bit too similar, but it’s totally fine for extended family.
I personally like [name_u]Zoë[/name_u] the best out of all the spelling options because that’s how my friend spells it, but I will warn that she has had issues with documentation not allowing special characters. [name_f]Zoe[/name_f] makes for an easier time with legal documents, but [name_u]Zoë[/name_u] is very pretty. I think this one depends on how much effort you’d be willing to go to get a special character. If you like both spellings fairly equally, go with [name_f]Zoe[/name_f]. If you significantly prefer [name_u]Zoë[/name_u] and are willing to deal with potential struggles, go with that.
I don’t think it’s too popular, but on the other hand, popularity is subjective. What really matters is if you think it’s too popular. [name_f]Do[/name_f] you mind that there may be another [name_f]Zoe[/name_f] in her class? With this name, there very well might be. I personally wouldn’t let this influence my decision on the name because no matter what your name is, there will (almost) always be someone else in your country/state with the same name. I was once in a class with two Ammikas, spelled exactly like that! I have never encountered another one.
I don’t think it’s a big issue - both names are popular in their own right. If they were siblings or twins it might be a different story. Regarding accents, the only one that I wouldn’t recommend is Zoè as the correct phonetic pronunciation would be [name_m]Zo[/name_m]-eh, rather than [name_m]Zo[/name_m]-ee.
Ditto.
Zoe is lovely! It is quite similar to [name_f]Chloe[/name_f] but the Z and hard K sounds are very different.
Zoe without the accent gets my vote out of practicality, but [name_f]Zoe[/name_f] with the umlaut is a close second.
I would do [name_f]Zoey[/name_f]. Like [name_u]Joey[/name_u]. [name_f]Zoe[/name_f]/Joe/Moe/Roe .vs. [name_f]Zoey[/name_f]/Joey
I think [name_f]Chloe[/name_f] and [name_f]Zoey[/name_f] (regardless of spelling) for aunt-and-neice are totally fine. No issue. But too matchy-matchy for siblings.
Thank you! I don’t love the spelling [name_f]Zoey[/name_f], it looks weird IMO.