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.
Colichemarde
The colichemarde blade configuration is widely thought to have been an invention of Graf von Königsmark, owing to the similarity in pronunciation of their names. However, the first blades of this type date from before the Count's lifetime. The colichemarde first appeared about 1680 and was popular during the next 40 years at the royal European courts. It was especially popular with the officers of the French and Indian War period. George Washington was presented with one during his inauguration. The widespread misapprehension that the colichemarde quickly ceased to be produced after 1720 dates to the opinion given by Sir Richard Burton in his "The Book of the Sword" dating to 1884. However, many securely dated colichemarde swords from as late as the 1770s can be found in collections.