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.
Tomb Raider: Legend
Lara pursues Amanda to Kazakhstan, where she discovers a 1950s-era Soviet research base that unsuccessfully tried to weaponise the sword's energies. Amanda, now bitter about the events in Peru, races her to the artefact. She eventually unleashes the tamed Entity on Lara using its control stone. Lara avoids the Entity and retrieves the sword fragment as the ancient facility disintegrates. Lara also discovers the shield of the knight who had the fragment, bearing an ancient map. The decoded map leads Lara to Cornwall and a King Arthur-themed tourist museum built over a hidden tomb complex, in turn housing the tombs of King Arthur and his knights around a broken dais. She realises that the sword she is pursuing is the legendary Excalibur—one of many swords forged by an unnamed civilisation that have created a monomyth within multiple later cultures—left in pieces and scattered across the world by Arthur's knights.