I've got an
Aileen friend, but as a name I really don't enjoy it. Most -een names don't appeal to me.
I like
Elspeth and
Fiona about equally, closely followed by
Bridget. And
Catriona looks beautiful but sounds less so; plus, people would probably guess it was four syllables instead of three.
Elspeth,
Fiona and
Bridget all sound healthy, energetic and intelligent, if that makes sense.