Tracey Davis (b. 1979-1980) was a half-blood witch who started attending Hogwarts School of Witchcraft and Wizardry in 1991. She was in the same year as Harry Potter and was Sorted into Slytherin house.
The name "Tracey" is from an English surname which was taken from a Norman French place name meaning "domain belonging to Thracius". It was used by Charles Dickens for a masculine character in his novel The Pickwick Papers (1837). It was later popularised as a feminine name by the main character Tracy Lord in the movie The Philadelphia Story (1940).