Quick answer
Hillary is a girl name.
Meaning and history
This name is a variant of Hilary. A famous bearer of the surname was Edmund Hillary (1919-2008), the first man to climb Mount Everest. It is borne by the American politician Hillary Rodham Clinton (1947-). The name dropped in popularity in 1993 after she became the first lady as the wife of Bill Clinton.
Notes and context
Usage: english