arthur, guinevere, lancelot, galahad, bedevere, merlin, numue, mordred, morgan le fey, morgause, ban of benoic, utherpendragon, kay, gawain, perceval....some more will come to me im sure
I should have pointed out that according to Graham Phillips in his "The Marian Conspiracy" (ISBN 0 283 06341 6) Most of the people mentioned by Incitatus were actual Welsh/English people who can be traced, and he does so very convincingly along with a lot more interesting material. (No, I have no connection what so ever, but funnily enough I have just finished reading it for the second time and found it difficult to put down)
Depending on which source you read, there were anything from 13 to 1,600 Knights of the Round Table alone, never mind anyone else! The Round Table hanging in Winchester Cathedral - not, of course, the 'real' one, if there ever was such a thing - has 25 knights' names inscribed on it. Click http://www.britannia.com/history/arthur/knights.ht ml
for a website with these names and lots of other Arthurian information. (I'm assuming that you actually want to know some of the names, rather than just setting us all a quiz!)
It's quite well accepted that the round table would have been created by the placing together of the shields of the Knights. Therefore the "table" could have been set up anywhere the knights met.
Taliesin, uwaine, sir pelinor, sir accolon, king uriens, king Lot, Niniane, Viviane, Nimue, Elaine, King Leodegrance, Queen Igraine (arthurs mum), Duke of Gorlois, theres loads.most of these come from Marion Zimmer-Bradley's "Mists of Avalon" which is v.good