Polly is a given name, most often feminine, which originated as a variant of Molly (a diminutive of Mary). Polly may also be a short form of names such as Polina, Polona, Pauline, Paula or Paulina.
My name is Polly. According to my mother, she named me Elizabeth at first, because the name means 'God's promise'. But I soon became Pollyanna. The God who made the promise called me Pol for short.