Excalibur
Geoffrey of Monmouth, in his "Historia Regum Britanniae" ("The History of the Kings of Britain", c. 1136), Latinised the name of Arthur's sword as "Caliburnus" (potentially influenced by the Medieval Latin spelling "calibs" of Classical Latin "chalybs", from Greek "chályps" ["χάλυψ"] "steel"). Most Celticists consider Geoffrey's "Caliburnus" to be derivative of a lost Old Welsh text in which "bwlch" (Old Welsh "bulc[h]") had not yet been lenited to "fwlch" (Middle Welsh "vwlch" or "uwlch"). In the late 15th/early 16th-century Middle Cornish play "Beunans Ke", Arthur's sword is called "Calesvol", which is etymologically an exact Middle Cornish cognate of the Welsh "Caledfwlch". It is unclear if the name was borrowed from the Welsh (if so, it must have been an early loan, for phonological reasons), or represents an early, pan-Brittonic traditional name for Arthur's sword.
Sword and sorcery
The term "sword and sorcery" was coined in 1961 by the celebrated American author Fritz Leiber in response to a letter from British author Michael Moorcock in the fanzine "Amra", demanding a name for the sort of fantasy-adventure story written by Robert E. Howard. Moorcock had initially proposed the term "epic fantasy". Leiber replied in the journal "Ancalagon" (6 April 1961), suggesting "sword-and-sorcery as a good popular catchphrase for the field". He expanded on this in the July 1961 issue of "Amra", commenting: