I wonder why/how it is that you know how the name is going to sound, but don't know the actual name...hmm.
In any case, I think the names
Aimee and
Ainsley are pretty and go well with
Damien , but if it's not quite what you're looking for, perhaps you'll like "
Serenity " which means "calm and soothing" and so does the name
Damien .