To be quite honest, I don't know if I've met any Kaylees (by any spelling), simply because the name meshes with every other similar name in my mind.
Kayla,
Kaylee,
Kylie,
Kyla, etc. Just so close to each other I don't notice the difference any more. Very trendy, cute enough sound, but nothing substantial or memorable about it.
As for
Hayley, I know at least a dozen of them with spellings
Hayley, Halee,
Hailey, Halley, and more.