In New Zealand, I've never heard anyone (barring immigrants) use any term other than Fizzy Drink. It's what I've always grown up hearing.
I always thought 'Pop' or 'Soda' sounded daft, but when you actually think about it, "Fizzy Drink" is pretty daffy sounding too.

Just what you grow up with, I guess :)
Was pleased to see it listed though. Hoorah for multicultural PerlMonks.

JP,
-- Alexander Widdlemouse undid his bellybutton and his bum dropped off --