First Xbox Live Gamertag Ever? Unknown—Microsoft Never Released It

Unknown. Microsoft never released this information.

Why It's Lost

• Xbox Live launched November 15, 2002.
• Early adopters were internal testers, press, developers.
• Gamertag database not public; no "first" leaderboard.
• Many early tags were generic (XboxUser1, Tester, MajorNelson — Larry Hryb, Xbox Live director).

Notable Early Tags

• MajorNelson — Larry Hryb (Director of Programming, Xbox Live).
• e — claimed by employee, later auctioned for charity.
• Xbox — reserved.

Fun trivia, but no definitive answer exists.