Good Grief!

In the Peanuts comic strip, Peppermint Patty’s real name is Patricia Reichardt

Patricia "Peppermint Patty" Reichardt is a fictional character featured in Charles M. Schulz's comic strip Peanuts. A freckle-faced brunette, she is one of a small group in the strip who lives across town from Charlie Brown and his school friends. Generally displaying the characteristics of a tomboy, she was the first female Peanuts character to wear pants. She made her first appearance on August 22, 1966. The following year, she made her animated debut in the TV special You're in Love, Charlie Brown and began (in the comics) coaching a baseball team that played against Charlie Brown and since has had other adventures with him. She calls Charlie Brown "Chuck" and Lucy "Lucille" and is the only character to do so (although Peppermint Patty's close friend Marcie has been known to call Charlie Brown "Chuck" on occasion, she usually calls him "Charles").

Peppermint Patty's birthday is on October 4, as determined from the October 4, 1970 strip in which Patty's father gives her roses on her birthday. Peppermint Patty has also been called "Priscilla", by Marcie in the TV special A Charlie Brown Thanksgiving, possibly a reference to Priscilla Mullins, one of the pilgrims.