Zaza is a diminutive of Isabelle. But there is nothing diminutive about this simple, yet fantastic drink.
Substitute Sloe gin or Fino sherry in place of gin.
Adapted from a recipe in Harry Craddock's 1930 The Savoy Cocktail Book. It is named after a French play which was a hit around the verge of the 20th century and was followed by opera and film versions.