Ivy looks good from a distance, but in a garden it is the world's most annoying plant.
Isla is at least easy to pronounce, unlike
Ayla, but it came from nowhere to being very well used and I don't know if it's likely to last very long.
The other problem with these two is that I just don't enjoy names that start with I - or Me, actually, like some versions of
Megan. They sound whiney and self-absorbed.
So,
Ingrid. I like
Sigrid a lot,
Astrid quite a lot and
Ingrid not so much. Here, however,
Ingrid is a clear winner.