The Secret Service traditionally has given pithy, private names to those whose lives they protect. The monikers are a throwback to a time when electronic communications were not encrypted, and they no longer serve a security function. Still, they give an occasional peek at the players’ personalities, in addition to serving as great trivia questions.

President-elect Barack Obama: Renegade
Michelle Obama: Renaissance
Malia Obama: Radiance
Sasha Obama: Rosebud

And then this article provides additional code names:

Vice President-elect Joe Biden: Celtic

Jill Biden: Capri

President George W. Bush: Tumbler

First Lady Laura Bush: Tempo

Bill Clinton: Eagle

Hillary Clinton: Evergreen

Chelsea Clinton: Energy

George Bush: Timberwolf

Barbara Bush: Tranquility

Jimmy Carter: Deacon

Rosalynn Carter: Dancer