Stacy

Stacy is an English name that originated as a medieval short form of Eustace, which derives from the Greek Eustakhios, built from the elements eu, meaning good or well, and stakhys, meaning ear of grain, together conveying a sense of fruitfulness. It was used for both boys and girls in medieval England, though by the twentieth century it had become predominantly feminine in American and British usage. The name gained widespread popularity in the mid-twentieth century as a standalone given name rather than a nickname. Related forms include Stacey, Stacie, and the masculine Eustace.