King Arthur's sword was Excalibur.
His sword
The Excalibur Sword.
Sword in stone, Excaliber, Merlin, Avalon
If we are talking Fire Emblem here, then my guess is Ragnell. But if your talking about King Arther's Sir Gawain, then you'll have to go on Google to find that out. But see, Ragnell was the name of King Arther's Sir Gawain's wife, i thank hats what I've heard, so that is why I say it is Ragnell. To add to this answer, I know nothing about Fire Emblem, but the previous answer is right in saying Ragnell is the name of Gawain's wife. However, his sword's name is Galatine (also Galatyn).
Which sword?There are two famous swords associated with Arthur, the sword he drew from the stone to prove his claim to the throne (which is usually just called "the Sword in the Stone"), and the sword he later received from "the Lady in the Lake", which goes by several different names in different legends, such as Caledfwich (in Welsh), Calesvol (in Cornish), Caliburnus (in Latin), or Excalibur (the name it is usually known by in modern times). All of these names mean something like "hard-cleave", with the Latin version being influenced by Latin chalybs "steel". Most sources have the Sword in the Stone and Excalibur being two different swords, but some legends conflate the two.The tale of the Sword in the Stone is similar to some versions of the Norse legend of Sigurd, who did much the same thing; that sword was called Gramr or Gram, Norse for "wrath".
excalaber
Excalibur
The sword in the stone is called Excalibur. It is the legendary sword of King Arthur in Arthurian legend.
King Arthur. It's the name of King Arthur's sword.
Excalibur
Excalibur
Ex calibur
His sword
King Arthur's magic sword was called Excalibur. It was said to have been given to him by the Lady of the Lake.
excaliber? the sword was not officially named in the movie but being a story of Merlin and a VERY young king Arthur it is safe to guess excalibur.
The Excalibur Sword.
The story about King Arthur is called Excalibur. In the story King Arthur himself is the one who managed to pull the sword out of the stone. The name of the sword is Excalibur.