“My names Austin Post, I was looking for a name because i already had all these song and I was looking for a name and I couldn't think of anything so i put my name in the rap name generator i'm sitting there, i'm f*ckin 14…” Post Malone told Noisey.
“We were all hanging out, chilling and drinking and then we were like, ‘Oh, Wu-Tang name generator, let's put our name in,'” Post Malone later revealed on “The Tonight Show” back in 2011. “And we're putting them all in, and they're all funny and stuff, and then mine came up and I was like, ‘you guys, it's not funny anymore. This is something big.' I just really liked it.”
Incase you want to create your own rap name, here is the link.