Evalach, Evelac, Evelake, Magdrains, Mogdains, Mondrames, Mordrain de Sarras, Mordrayns, Mordrayous

Evelake being his old pagan name and Mordrains his name as a baptized Christian. He and his brother-in-law, Nascien, were contemporaries of Joseph of Arimathea, with whom they came to Britain with their families.

Despite a warning voice, Mordrains tried to see the Grail and, not being quite good enough, was blinded and paralyzed for the attempt. Meekly accepting his punishment, he prayed to be allowed to live to see Galahad.

A voice, heard only by Mordrains, Nascien, Joseph, and Josephe, promised him this favor, adding that he would be healed when Galahad visited him. He waited several centuries, praying in a monastery, for Galahad to come. Upon being healed at last by Galahad, Mordrains enjoyed a holy death in his arms.

The fact that Evelake and Mordrains are the same man is not apparent in Malory, and there is one passage in which I strongly suspect Malory or his editor confused the names of Nascien and Mordrains.

See also
Abbey of King Mordrains | The Legend of King Arthur
Flegentine | The Legend of King Arthur
Sarrasinte | The Legend of King Arthur