I lived with a guy for 6 months and I thought his nickname was "alchi" because he was an alcoholic. Turns out his name was actually Alfred and they called him Alphi.
The way I look at it is whatever sticks, sticks. I’m not trying to tell people what to call him, I’m just relaying what they call him elsewhere. No big deal. Interestingly enough, I call him “Jalen Green”.
Funny you bring up dream. He was so against idolatry that he declined a statue being built in his honor. Not calling another human being an idol.
I'm sure that roommate and Sengun are great people; I will stick with plain Sengun. His name alone stands out by itself like Pele, Messi, Lemieux, Rocket legend Melo.
I'm not seeing any suggestions that immediately stand out as keepers. I just ask that it's not the lame, lazy initials+jersey number combo. May I suggest we wait on it for a while to see what's most appropriate? No need to rush these sort of things.