Green’s Dictionary of Slang

Sharon n.

also Tracey, Tracy
[archetypal working-class name]

(UK middle class) a pej. generic term for a working-class young woman regarded as overly flashy and socially unacceptable; a female Kevin n.

OnLine Dict. of Playground Sl. [Internet] Sharon and Tracy n. names used together or singly and supposed to belong to girls who are often amoral, usually working class, and always vulgar.
[UK]G. Malkani Londonstani (2007) 211: Living it up in Leicester Square with all the tourists, tramps and Traceys.