Star Trek: 12 Biggest Ever Retcons
4. Vulcan Used To Be Vulcanian
The Vulcans are one of the most iconic species in Star Trek, but they weren't always called Vulcans. Although the planet was called Vulcan, the people who lived there were referred to as Vulcanian in early episodes. Spock referred to himself as half-Vulcanian on a few occasions, and Kirk once referrenced a Vulcanian expedition he had been a part of in Court Martial.
In later episodes, the term Vulcanian was dropped and exchanged for the regular term Vulcan. Ever since, it has been the accepted practice to refer to both the planet and its inhabitants by the single term of Vulcan.