Zhu Bajie, also named Zhu Wuneng, is one of the three helpers of Xuanzang in the classic Chinese novel Journey to the West. He is called "Pigsy" or "Pig" in many English versions of the story.
Zhu Bajie is a complex and developed character in the novel. He looks like a terrible monster, part human and part pig, who often gets himself and his companions into trouble through his laziness, gluttony, and propensity for lusting after pretty women. He is jealous of Sun Wukong and always tries to bring him down.
His Buddhist name "Zhu Wuneng", given by Bodhisattva Guanyin, means "pig (reincarnated) who is aware of ability," or "pig who rises to power", a reference to the fact that he values himself so much as to forget his own grisly appearance. Xuanzang gave him the nickname Bājiè which means "eight restraints, or eight commandments" to remind him of his Buddhist diet.
In the original Chinese novel, he is often called dāizi (呆子), meaning "idiot". Sun Wukong, Xuanzang and even the author consistently refers to him as "the idiot" over the course of the story. Bodhisattvas and other heavenly beings usually refer to him as "Heavenly Tumbleweed", his former name when he was a heavenly marshal.
Read more about Zhu Bajie: Character, Preexistence, Nine-toothed Rake