Where did caliburn come from?

Caliburn is a legendary sWord associated with King Arthur in Arthurian legend. It is often considered to be the sWord that Arthur drew from the stone, proving his right to the throne. Some versions of the myth also refer to it as Excalibur, although the two names can represent different aspects of Arthur's sWord in various tales. The origins of the name "Caliburn" are believed to trace back to Latin and Welsh influences.