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Well, Caliburn is the Sword in the Stone in some versions of the Arthurian mythology; in all those versions, Excalibur is a separate sword given to King Arthur by the Lady of the Lake.
Also, to get all obvious sword names I can think of out of the way (one is a spoiler for Zelda:SS):
Excalibur, Masamune, Ghirahim, ANYTHING related to the Master Sword, the Four Sword, or any other Zelda sword, whatever the Kirby Sword creature is called, any character in any mythology or video game that wields a sword called Excalibur or Masamune.
Generation (pi)(i). When you see this, raise e to the generation and add 1. Social experiment.