Quite a lot really, so why Audrey?
There are several possibilities: number one is a love of Audrey Hepburn, or since they are young things, Audrey Tautou. Maybe they have been watching too much British TV and have a thing for Audrey from Corrie or more understandably Audrey fforbes-Hamilton. Or maybe, Audrey Flack (I cheated/googled on that one) but looking at her work, perhaps not. Or Audrey Niffenegger but I hope not because I thought The Time Traveller’s Wife was dreadful.
Or maybe, just maybe, someone Swedish, or maybe it was just a name they liked.