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.
Galfridus Walpole
According to legend, Walpole's sword, used on HMS "Lion", was given to a young Horatio Nelson, who is reported to have been carrying it when he too lost his right arm, in the Battle of Santa Cruz on 15 July 1797. The Walpole sword, which has a silver-hilted hanger, was made by Nixon Cutlers of London, has London silver hallmarks for 1752, and a 60 cm curved blade. Due to its provenance, the sword is known as the Galfridus Walpole — Suckling Sword, having been given to Walpole's godson and great nephew Maurice Suckling whose sister Catherine Suckling was Nelson's mother. William Suckling, Maurice's brother, gave the sword to Nelson, who wore his uncle's valued gift in his early career. The sword appears to have been returned to the Suckling family.