What was the monsters names in Monsters Inc what does the p in James Sullivan stand for?

In "Monsters, Inc.," the main monsters are James P. Sullivan, commonly known as Sulley, and his best friend Mike Wazowski. The "P" in James P. Sullivan stands for "P.," which has been humorously left undefined in the film. Sulley is a large, blue, and furry monster, while Mike is a small, green, one-eyed monster. Together, they work at a factory that generates energy from children's screams.