Quick answer
Gary is a boy name meaning "spear".
Meaning and history
From an English surname that was derived from a Norman given name, which was itself originally a short form of names beginning with the Old German element ger meaning "spear". This name was popularized in the late 1920s by the American actor Gary Cooper (1901-1961), who took his stage name from the city of Gary in Indiana where his agent was born. It was especially popular in the 1940s and 50s, breaking into the American top ten in 1950, though it has since waned.
Notes and context
Usage: english