His real name is Leon. He added the De to be more ethnic.
I thought you were kidding...
Per wiki...
“De León’s true surname is Leon. He began to use de León while in college in an effort to “somehow connect” with his father, who he never knew. De León was born in Los Angeles to Andres Leon, a Guatemalan-Chinese cook, and Carmen Osorio. Both had families of their own when Kevin was born. De León grew up in the Logan Heights neighborhood in San Diego with his mother.”
So, a bastard in every sense of the word.