is pronunced as "pee" not "pie".
My guess is that users with native English speech pronunce as "pie" because they spell "i" like in alphabet.
Really? I didn't know that. I once had a 10 minute discussion with a guy on the correct way to pronounce . He wasn't Greek himself, but had studied it a bit. (I had a Korean Physics professor who simply called it "squiggly." ) Of course, if I started talking to someone about "pee" they'd never understand I was talking about "pi."