Possible Clues:

• Unidentified person the writer's girl recalled
• John Doe, e.g
• Soon unknown male gets pen name
• Mr. X, in mysteries
• Assumed or false name
• Soon, your setter's turning up as 'Giovanni'?
• John Doe, commonly
• One not identified turned up in academy — no name
• Soon switched my name, such as Brendan
• By and by that's up to my Crosaire