NASA wouldn’t allow anyone else to change anything like that – while its still putting the money in. There were rumours that people could suggest a more futuristic or exciting name for SLS, but yeah bureaucracy won, which it should I guess.

What's in a name? Possible NASA naming contest for SLS nothing new

Link: https://www.spaceflightinsider.c

It appears that NASA's new super heavy-lift booster might be given a name through a contest held.