"Big Bird" - because that's what it is when comparing it to the rest.
There is no reason for great fuzz over that bird. It is after all only a new airliner type which happens to be roughly 30% larger than another large airliner which flew 36 years before Big Bird takes off from the ground first time.
And it has the size which its builder thinks will fit the market between 2006 and 2050. If the market had demanded a 1200 pax plane, then its builder would have made that instead, with eight engines instead of four. As for now it is just the big bird.
Best regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs