There are several possible eight-letter words that could refer to a knight of the Round Table in Dutch:
LANcelot: One of the most famous knights of the Round Table, known for his bravery and skill in combat.
GAWAIN: Sir Gawain, also known as Gawan, was a nephew of King Arthur and one of the most prominent knights of the Round Table. He was known for his courtesy, fairness, and strength.
PERCEVAL: Sir Perceval, also known as Percival or Parsifal, was a knight who embarked on a quest to find the Holy Grail. He was known for his purity and innocence.
TRISTAN: Sir Tristan was a Cornish knight known for his love affair with Isolde, the wife of King Mark. He was also a skilled warrior and archer.
PARSIFAL: Another name for Sir Perceval, also associated with the quest for the Holy Grail.
GALAHAD: Sir Galahad was the son of Sir Lancelot and known as the purest and most holy of the knights of the Round Table. He was the only knight able to achieve the Holy Grail.
LANCELOT: Another possible spelling of Lancelot, with eight letters.
GAWAINE: Another possible spelling of Gawain, with eight letters.
The specific word that fits best will depend on the context in which it is used. For example, if the word is part of a crossword puzzle or other word game, the specific spelling and clues provided may help narrow down the options.