I'd take a huge univentive, yet risky move of naming it ''N64'' internally refer to it as the N64k or N64'000 and then advertise it as the ''new N64''
Reason being that its the only Nintendo system to resonate with the mainstream yet not be reliant on a childish image or family specifc audience. NES and SNES did the same but those titles sound dated to me. Nintendo alone would be decent but I still think Nintendo's name carries some negative childish connotations for many audience. N64 is rich with nostalgia whilst also sounding like a modern tech device
tell me what you'd name it :)