Hebrew Meaning: The name Nancy is a Hebrew baby name. In Hebrew the meaning of the name Nancy is: Grace. American Meaning: The name Nancy is an American baby name. In American the meaning of the name Nancy is: Grace.French Meaning: The name Nancy is a French baby name. In French the meaning of the name Nancy is: Favor; grace.English Meaning: The name Nancy is an English baby name. In English the meaning of the name Nancy is: Favor; grace. Aintroduced to Britain in the 13th century.merican Meaning: The name Nancy is an American baby name. In American the meaning of the name Nancy is: Grace. French Meaning: The name Nancy is a French baby name. In French the meaning of the name Nancy is: Favor; grace.