I have loved all of these in the past and still do now.
Which one would you pick and why?
[name_f]Eilidh[/name_f] - pronounced ay-lee
[name_u]Haley[/name_u] - pronounced hay-lee
[name_f]Kailey[/name_f] - pronounced kay-lee
Would you change spellings?
I would choose Eilidh!! I think it’s so unique, and has lovely Gaelic roots
[name_f]My[/name_f] second choice would be [name_u]Haley[/name_u], spelled [name_f]Hayley[/name_f] 
I think [name_f]Hayley[/name_f] and [name_f]Kaylee[/name_f] are more trendy than unique-yet-traditional [name_f]Eilidh[/name_f]
[name_f]Eilidh[/name_f] - so sunny and beautiful!
[name_f]My[/name_f] favorite is [name_u]Haley[/name_u], and I think I like this spelling the most.
I do not like [name_f]Eilidh[/name_f]. The real pronunciation is pretty, but I look at it and read “eyelid”. I’m sure I am not the only person who wouldn’t know how to pronounce this name.
[name_f]Eilidh[/name_f]
eilidh!! a lovely Gaelic choice that feels most fresh (although not completely fresh)
I think [name_f]Eilidh[/name_f] would be very difficult to live with where I’m from (USA), so my preference is for [name_f]Kailey[/name_f] or [name_u]Haley[/name_u]. I like the look of [name_f]Kailey[/name_f] more, but my favorite singer’s name is [name_u]Haley[/name_u] so that association boosts that name a lot for me!
the lovely [name_f]Eilidh[/name_f]! one of my favourite names 
[name_u]Haley[/name_u], i would change ut to [name_f]Hailey[/name_f] / [name_f]Haylee[/name_f] /Hayley or [name_f]Hayleigh[/name_f]
[name_f]Kailey[/name_f]- i would chanve it to [name_f]Kaylee[/name_f], [name_f]Kayleigh[/name_f]
[name_f]Eilidh[/name_f] 
Eilidh - feels the oldest and the freshest at the same time, but it could be a chore of a name depending on where you live - would it be colonialist to change to Aylee? It’s such a pretty name! Only downside is it might sound like “ailing”?
Haley - this is a 90s/Y2K name in my mind (or Hailey/Hayley is). The Haley spelling is pretty and makes it more contemporary. I like this name, it sounds lovely - it still just feels a little dated and young for me! I’d probably pick it because I don’t love K names.
Kailey - I agree with above, I would probably spell it “Kaylee” (or even Kayley). Kailey could sound like Kayel-Lee (ie three syllables). Either way, I think this is the best of the three if Eilidh too much for a child to wear (and explain each time, defend from “eyelid” etc), and because it (Kailey) seems the most current. I don’t like K names but I still think this is probably the best, given my reasons against are a little peculiar.
Other names you might like: Keeley, Holly, Keira, Kiara, Marlowe, Carys, Neve.
Eilidh!!! [name_f]Beautiful[/name_f] name. [name_f]Lovely[/name_f] in its original form.
[name_u]Haley[/name_u] would be my second choice! Also sweet. Like [name_f]Kailey[/name_f] spelled [name_f]Kaley[/name_f] or [name_f]Ceilidh[/name_f]
Thanks, I actually do like [name_u]Keeley[/name_u]
[name_u]Haley[/name_u] would be my favorite of these! I would spell it as [name_f]Hailey[/name_f] though 
[name_f]Kailey[/name_f] is sweet, but I’ve never found myself gravitating towards it, and [name_f]Eilidh[/name_f] is hard for me to remember how to pronounce since I am a native [name_f]English[/name_f] speaker and the spelling confuses me a lot 
[name_f]Eilidh[/name_f] is my favourite!
[name_f]Eilidh[/name_f]. I think in time people will become familiar with the spelling.
I know a [name_f]Kaylee[/name_f] and it would be hard if her name [name_f]Ceilidh[/name_f] well I had trouble spelling that maybe Caelei or Ceileigh
[name_f]Hailey[/name_f] spelled like this, no real reason besides personal preference.
I like [name_f]Eilidh[/name_f] best! 
As a 2000s baby, I find [name_f]Hayley[/name_f] / [name_f]Hailee[/name_f] and [name_f]Cayley[/name_f] / [name_f]Cailey[/name_f] (my preferred spellings of the two) so common and very dated to the 2000s.
[name_u]Haley[/name_u] is the most timeless of the three, in my opinion, so that’s what I would pick.