I was trying to recall just how early "Big N" was a nickname for Nintendo, thinking it must have predated the Nintendo 64, but it took a bit of digging to find anything concrete:

https://archive.org/details/run-magazine-87/page/n17/mode/1u...

My naive first thought was "Captain N: The Game Master" but that wasn't quite "Big N." But it was fun to visit a bunch of old Nintendo-related articles.