I personally think Perry (or Perri) is a boys name, sorry! I think it's a lovely name, it just doesn't 'feel' right for a girl for me.
But I'm sure it's something that I'd get used to, lets face it we all get used to a name if we hear it enough.
MY issue wouldn't be that though. After working on phones etc all the time, I can think of one big problem. She'd be guaranteed to get "What was that? Kerry?" a LOT. Not even just when she's talking on the phone, filling out forms etc would be a pain too.
But I'm pretty sure that's only going to be a small part of her life so it may not be an issue. I just know from having a surname that sounds like a common word if you change one letter, that it gets pretty frustrating to have to spell your name out pretty much every time you tell someone what it is .