Quick answer
Lacy is a boy/girl name.
Meaning and history
From a surname that was derived from Lassy, the name of a town in Normandy. The name of the town was Gaulish in origin, perhaps deriving from a personal name that was Latinized as Lascius. Formerly more common for boys in America, this name began to grow in popularity for girls in 1975.
Notes and context
Usage: english