Excalibur has many names in different languages so it can be easy to confuse those. It should be noted that in some works Excalibur and the Sword in the Stone are different entities so in that sense the Sword in the stone is also a "legendary" sword.
Arthur has other weapons associated with him; this is from wikipedia:
"Excalibur is by no means the only weapon associated with Arthur, nor the only sword. Welsh tradition also knew of a dagger named Carnwennan and a spear named Rhongomyniad that belonged to him.
Carnwennan ("Little White-Hilt") first appears in
Culhwch and Olwen, where it was used by Arthur to slice the Black Witch in half.
[1][22] Rhongomyniad ("spear" + "striker, slayer") is also first mentioned in
Culhwch, although only in passing; it appears as simply
Ron ("spear") in Geoffrey's
Historia.
[1][3] In the
Alliterative Morte Arthure, a
Middle English poem, there is mention of Clarent, a sword of peace meant for knighting and ceremonies as opposed to battle, which was stolen and then used to kill Arthur by
Mordred.
[23] The
Prose Lancelot of the
Vulgate Cycle mentions a sword called Seure, which belonged to the king but was used by Lancelot in one battle.
"[24]
Also Lancelot's sword is sometimes given a legendary status; here's a wikipedia list of the anglo-saxon related mythical swords:
Swords from the
Matter of Britain
- Arondight, Lancelot's sword.
- Clarent, a sword of peace meant for knighting and ceremonies as opposed to battle, which was stolen and then used to kill Arthur by Mordred.
- Coreiseuse (Wrathful), the sword of King Ban, Lancelot's father.
- Excalibur (also Caluburn, Caledfwlch, Calesvol, Kaledvoulc'h, Caliburnus), sometimes attributed with magical powers or associated with the rightful sovereignty of Great Britain. Stated that it was forged in the Isle of Avalon.
- Galatine, the name of the sword given to Sir Gawain by the Lady of the Lake.
- Grail Sword, a cracked holy sword which Sir Percival bonded back together, though the crack remained.
- Secace, The sword that Lancelot used to battle the Saxons at Saxon Rock. It is translated as Seure (Sequence) in the Vulgate Cycle.
- Sword in the Stone, a sword in the Arthurian legend which only the rightful king of Britain can pull from the stone; sometimes associated with Excalibur.
- Sword with the Red Hilt, One of the swords wielded by Sir Balin. After his death, Merlin sealed it in the float stone where it remained until it was drawn by Sir Galahad.