But I try to keep my real name undercover
Cause if you hear my name, then you think it's jokes

from Childish Gambino – The Last Lyrics on Rap Genius

Meaning

People associate “Donald Glover” with stand up, 30 Rock, and the NBC show Community.

Another (pretty solid) reason: when you say Donald Glover fast, it becomes dong lover, which will be referred to as a joke.

Rap names are supposed to be hard and gangster, not gay and immature.

Pussy ass Donald Glover. That dude don’t love women. That dude love dongs
-Potential hater

CG has mentioned this issue before

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