That's funny that three of you associate the name
Niles with a British man! I've never heard it used here. My only association is with
Niles Crane, and I guess it does sound a bit pretentious because of him.
I've heard people using Nile and then there's
Niall which I quite like but I would assume a
Niall was Irish or had Irish connections. And while One Direction are MASSIVE as LMS pointed out, I don't really associate the name
Niall with them, but I'm not their target audience. I have trouble remembering all their names anyway.