Stacy

Stacy is an English name that originated as a medieval short form of Eustace, itself derived from the Greek Eustakhios, meaning "fruitful" or "productive," from the elements eu (good, well) and stakhys (ear of grain). It was used for both boys and girls in the Middle Ages, but by the twentieth century it had become predominantly feminine in English-speaking countries. The name gained widespread popularity in the United States and Britain during the 1960s and 1970s. Related forms include Stacey, Stacie, and the masculine Eustace.