Nonemployee

Nonemployee is the general name MLB uses almost everywhere. This name originated from a t-shirt his uncle got him that showed a gamer and said "Non-Employee of the month." MLB still owns this shirt, and has called it his "shirt of identity" since then.

Future References
It is possible in the future, MLB will change his name to Non-employee, hinted in his many sketches of future Let's Play splash-screens and promotional images. However it is unclear whether he will stay on his original channel or creat a brand new one altogether. It is likely Non-employee will be his future identity since a Non-Employee theme song has already been written.