Quick answer
Hayley is a girl name.
Meaning and history
From an English surname that was originally derived from the name of an English town (meaning "hay clearing" from Old English heg "hay" and leah "clearing" ). It was brought to public attention as a given name, especially in the United Kingdom, by the British child actress Hayley Mills (1946-). This is the most common spelling of this name in the United Kingdom, Australia and New Zealand; in the United States the spellings Haley and Hailey are more popular.
Notes and context
Usage: english