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.
Lost Girl (Once Upon a Time)
Hours later, Snow calls out Rumplestilskin to ask him about Excalibur, and is willing to make a deal. As Rumplestiltskin appears, he tells her the sword is a fake–the real sword is still in Camelot–and it was Charming's idea to have her run through the sword in the stone routine. He takes her mother's necklace as payment for wasting his time. Snow returns to the campout to talk to Charming, who told her that the sword was to make her believe that she can stand up to Regina and it was all her doing without any magic. The two kiss and make up.