Two entries with the name Meliant.
Meliant
A nephew of King Faramon of France in the Prose Tristan.
He was accused of theft at the same time that Faramon’s daughter, Belide, falsely accusted Tristan of rape. Faramon offered Belide a choice of saving either Meliant or Tristan; when she chose Tristan, he knew she was lying about the crime.
The same character is named Brano in La Tavola Ritonda.
Source
Prose Tristan | 1230-1240
Meliant
Melianus
An ancestor of Gawain, descended from Peter.
Meliant inherited the kingdom of Orkney from his father, Herlan, and passed it on to his son, Argistes.
Source
Vulgate Estoire del Saint Graal | 1220-1235