Quick answer
Shelby is a boy/girl name.
Meaning and history
From an English surname, which was possibly a variant of Selby. Though previously in use as a rare masculine name, it was popularized as a feminine name by the main character in the movie The Woman in Red (1935). It was later reinforced by the movie Steel Magnolias (1989) in which Julia Roberts played a character by this name.
Notes and context
Usage: english