Well, Aragorn goes by Estel and/or Strider to keep his identity (Aragorn, heir to the throne of Gondor) secret (the enemy Sauron will kill him if it is revealed that the king of Gondor still lives) in The Lord of the Rings.

Not sure if this is what you mean or not...

Battle On,
Deadly Chakram

"Being with you is stronger than me alone." ~ Clark Kent

"One little spark of inspiration is at the heart of all creation." ~ Figment the Dragon