Okay, so those are the characters, mostly. Now let’s get into something else–weapons.
There are a variety of weapons cited throughout the legends.
First and foremost, of course, is Excalibur (Caledfwlch in Welsh). The Welsh name translates as something like “Hard Cleft”. Caledfwlch appears in early Welsh tales.

This sword was given to Arthur by the Lady of the Lake and, in some versions, made by her especially for Arthur. In some versions, it was inscribed “Take me up” on one side and “Cast me away” on the other. Also, in some versions, when the sword was drawn in Arthur’s first battle, its blade was so bright that it blinded his enemies.
Although the story of the Sword in the Stone appears much later, that sword was never Excalibur. The Sword in the Stone was Clarent, a sword used mainly for ceremony. And, in some late versions, Mordred stole Clarent and used it against Arthur at the Battle of Camlann. None of that seems to be part of the original legend, however.
Excalibur’s scabbard has no name (at least that I’ve been able to find), but it was said to have powers of its own. Any wounds received while wearing the scabbard would not bleed so that the wearer could not be killed easily. This is interesting in light of the healing reputation both of Avalon and at least some of the Ladies of the Lake. In very late stories, such as Le Morte d’Arthur, Morgana (possibly a Lady of the Lake herself) stole the scabbard and threw it into a lake. This enabled Mordred to kill Arthur, years later.
Arthur possessed other weapons, according the Welsh traditions:
A dagger called Carnwennan (translated “Little White Hilt”), which he used to slice a witch in half in Culhwch and Olwen. Sometimes, Carnwennan is said to have the power to shroud its wielder in shadow.
A spear called Rhongomyniad (translated “Spear Striker”). Later versions simply call it Ron, meaning “Spear”.

Arthur’s shield was Wynebgwrthucher (translated “Face of Evening”).
Not a weapon, exactly, but his ship was Prydwen (“Fair Face”).
I want to mention one more weapon, though not one of Arthur’s.
Galatine was Gawain’a sword, also given to him by the Lady of the Lake. The name is clearly not Welsh, but I haven’t been able to find a Welsh name for it, which may—or may not—indicate that it’s not part of the older stories.
Galatine is strongest in sunlight. Sometimes even said to make its wielder invincible in sunlight.
Clarent is Latin, meaning something like “Be bright”.
Wonder if this is a conflation with the sword “so bright it blinded his enemies”.
Also tends to confirm it’s a late addition.
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Interesting. I suspect it is a late addition.
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