This is NOT a name. AT ALL. I'm a native Spanish speaker.The only reason Ernesto "el Che" Guevara was nicknamed "el Che" is because he was Argentinian (the reasoning for this comes rom the fact that "Che" is a common Argentinian mannerism/linguistic filler so it was a way to set him part).
Being from Argentina, I have never heard this used as a name. People just use 'Che' as a formal kind of "Hey you". The only way I can think to compare this is to say that it is kind of used like "Dude" in the States.