Whats Master Chief's real name

I have only heard Cortana say "chief" That is all I Heard and I've tried looking it up, but I found nothing
Best Answer
Master Chief's real name is John. Nobody really knows his what his last name was as when we was "acquired" for the Spartan II program he was simply John-117.
You can read more about John's backstory by reading The Fall of Reach(a better choice) or by reading the Wiki here(a quicker choice)
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Why is John called Master Chief?
John led the Spartans through many victories against the Covenant, but at a cost, as he lost members of his Spartan family under Covenant fire, including his best friend Sam. By the age of 17, he had officially been decorated as a Master Chief - albeit only so UNSC Marines and Drop-Troopers would obey his orders.Is Master Chief a human?
In Halo lore, Master Chief is a human with genetic enhancements. Also known by his full name, Master Chief Petty Officer John-117, the Chief is a type of supersoldier known as a \u201cSpartan\u201d, readied for combat from a young age.Is Master Chief Black?
Nope, but master chief is confirmed white, so it doesn't make any sense for them to do that. The point of the marketing has kinda hinted that: \u201cYou are Master Chief\u201d no matter what or who you are.The Entire Story Of Master Chief! (Birth To Halo Infinite)
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Answer 2
His first name is John. His last name is unknown (he was abducted by ONI when he was 6). His designation in training was John-117, and throughout the Covenant War before the events of Reach he was just Spartan-117 or Master Chief.
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