(Additionally, Melville may have been inspired by the similar-sounding name Barnaby.)
(Source: clevelandkentevans)
The surname of Kings Arthur and Uther, meaning “head dragon” or “dragon’s head.” As first told by Geoffrey of Monmouth, Uther adopted the symbol of the dragon because of the comet with the dragon’s head that Merlin had seen in Wales, heralding the death of King Ambrosius Aurelius, Uther’s brother. In Welsh legend, it is also the surname of one “Gwen Pendragon,” who once kept Arthur prisoner.
In the Prose and Vulgate Merlins, the name Pendragon is given to the character elsewhere called Ambrosius Aurelianus: the son of Constantine and Ivoire, the uncle of Arthur, and the king of Britain between Vortigern and Uther, Pendragon’s brother. Pendragon allied with Merlin, defeated Vortigern and Hengist, died fighting the Saxons, and was buried at Stonehenge. Uther is said to have adopted his brother’s name as a surname in memory of the slain king.
Source: Christopher Bruce's Arthurian Name Dictionary