Brandon takes its name from Saint Brendan the Navigator, or Bréanainn, who is said to have been born in what is now County Kerry in 484 AD, and is chiefly known for his legendary voyage in a boat of wood and leather to discover the Isle of the Blessed, also called Saint Brendan's Island. In the story of Brendan's life (titled, the Beatha Bhréanainn, or the Latin version, the Vita Brendani), he spent three days fasting on the mountain before his voyage, was visited by an angel, and experienced a vision of a great land to the west; the mountain is described as being surrounded by the ocean, which fits with the topography of Mount Brandon.