Quick answer
Shelley is a boy/girl name meaning "clearing on a bank".
Meaning and history
From an English surname that was originally derived from a place name meaning "clearing on a bank" in Old English. Two famous bearers of the surname were Percy Bysshe Shelley (1792-1822), a romantic poet whose works include Adonais and Ozymandias, and Mary Shelley (1797-1851), his wife, the author of the horror story Frankenstein. As a feminine given name, it came into general use after the 1940s.
Notes and context
Usage: english