we only ever find out his first name John.
yes master chiefs real name is john just read the halo book about planet Reach it will tell you.
i think it is john 117
master chiefs real name is "John" as cortana says in the end of legendary "pleasure working with you, John."No if you play halo 3 and you listen very carefully you may see or here them say sierra 117. John is right but his full name is "John Sierra"
Master Chief is most definitely male. In the games, his voice is clearly male, and he is always referred to as male. In addition, the official backstory has him being a boy named "John" prior to him being selected to become a Spartan. Master Chief is a rank not a name, in the halo trilogy the main character is a spartan by the name of John-117 who is a male, but there are female master chiefs.
master chiefs name is only referred to once in the first 3 halo games, in that reference they just call him John. He doesn't work for the USAF (whatever that is) but he does work for the USNC (United Nations Space Command). info from: halopedia.com
Master Chief's partner is the Arbitor, an elite-class ex-Covenant who goes on dangerous missions for his race with John 117
Master Chief Petty Officer John-117, his name is John
john forge Master Chief's name is John Forge in Halo:Wars he Sergant John Forge.
He doesn't have one.
His first name is John.
Yes, Master Chief's real name is John and his Spartan designation is 117.