Namely Aeryn Sun, from Farscape?
I love the name, and so does DH - we both like the slight difference in pronunciation from Erin, (though realise it would almost certainly be said 'Erin' by everyone else.
Plus the character is supremely badass and I loves her.
So would it be an awful name to inflict on a little girl? I can't decide... I like Madeleine as a middle name to go with it.
NB: Aeryn Madeleine is still a strictly hypothetical child and will hopefully remain so for at least the next three years...