What was the real name of master chief?

Master Chief Petty Officer John, Spartan 117 of the SPARTAN-II program. He was born in the year 2511, in Elysium city on Eridanus-II. He has brown hair, and is 6'6" without his armor on (extra height due to physical enhancement).

I hope this has helped you; if you have more questions, my Gamertag is below:

Gamertag: PyT Shad0w, Level 50
Jhon Living Myshers