When the French engineer DeLabat visited Chibouquetou (McNabs Island) in 1711 he prepared a map of the entrance to Halifax Harbour. The name Devils Island originates from a Frenchman named Deval or Devol who at one time owned the island. Over the years the pronunciation was changed to Devils. http://mcnabsisland.ca/devils_island
As for me I've never been on the island, but do like the view.
Thanks so much, I appreciate your lovely comments. :)