I had also heard of a family that lived there so I did a little research and found this......
Discovery Island was originally called Treasure Island. The island in Disney's Bay Lake, near the River Country water park, was named Raz Island from 1900 to 1937, after a family that lived there. The island also was the home of Florida's first radio disc jockey, Radio Nick, in the late 1930s, according to "Since The World Began," a history of Walt Disney World. Disney bought the island, which was a hunting retreat at the time, in 1965. When opened as Treasure Island, it was Disney World's second attraction, following the 1971 opening of the Magic Kingdom.