Boeing 747-400, Why is it called that?

The Boeing range of planes goes from the 727 all the way up to the 787 dreamliner. The list of the planes according to size is: 727 737 757 767 777 747, -so why is the Boeing jumbo jet, the largest of them all not called the 787 (well that is now the name for the Dreamliner but when the 747-400 was first... show more The Boeing range of planes goes from the 727 all the way up to the 787 dreamliner.

The list of the planes according to size is:
727
737
757
767
777
747, -so why is the Boeing jumbo jet, the largest of them all not called the 787 (well that is now the name for the Dreamliner but when the 747-400 was first made the 787 name was available)

I am just wondering why Boeing did this.....
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