What is the meaning of the word "galahad"?

Definitions:

A figure from Arthurian legend, known as the epitome of chivalry, purity, and virtue. NOUN
- Sir Galahad was revered for his purity and his success in the quest for the Holy Grail.
One of the Knights of the Round Table and is particularly renowned for his quest to find the Holy Grail. NOUN
- Galahad's story is a cornerstone for Arthurian legend, emphasizing the triumph of spiritual ideals.
Term sometimes used metaphorically to describe someone who is exceptionally noble, pure, or selfless. NOUN
- He is a modern-day Galahad, always standing up for what is right.