Kartan was a male human inhabitant of the Deneva colony who was killed by the invading neural parasites in 2267. (TOS episode: "Operation -- Annihilate!")

Kartan was a male Denevan who was engaged to Aurelan. After the parasite invasion, Spock chose this man at random to attempt a cure. (TOS novelization: Operation -- Annihilate!)

Kartan article at Memory Alpha, the wiki for canon Star Trek.