Patty (given name)
Patty is an English given name that originated as a rhyming diminutive form of names such as Martha via the diminutive Mattie, much in the same way that Peggy was derived as a rhyming variant of Meg or Meggie, an English diminutive of Margaret, and Polly was originally derived as a rhyming variant of Molly, an English diminutive of Mary. The alternation of the letter P with the letter M in these English hypocorisms is not understood.