According to T.H. White's 1938 classic "The Once and Future King," King Arthur's childhood nickname was Wart. This common and unassuming name sits in stark contrast to the glory that Arthur obtains, once he becomes king.
Wart's childhood is covered in Part One of "The Once and Future King." The young orphaned ward of the obscure knight, Sir Ector, is raised without knowledge of his regal parentage. Early in the book, the great magician Merlin enters Wart's life as a teacher, shaping and molding him into the great king that he is destined to be. In 1963, Disney turned this section of "The Once and Future King" into an animated film, "The Sword in the Stone."