Original: It was originally broadcast under the name Survivor but its official title was changed to Survivor: Pulau Tiga to distinguish it from subsequent installments of the series, and then changed again to Survivor: Borneo to avoid confusion with Survivor: Palau.
Simplified: When it was first being shown, it was simply called Survivor but its official name has been changed to Survivor: Borneo, so viewers can tell which season they are watching. Before the change to Survivor: Borneo, the season was known as Survivor: Pulau Tiga, but it was changed again to its current name so viewers would not get this season confused with the tenth season, Survivor: Palau.