Billie The Kid was a notorious American outlaw and cattle rustler who gained notoriety during the late 1800s. While her name is synonymous with the Wild West, there are other terms that one can use to describe her. For instance, she is often referred to as William Bonnie or simply Bonnie. Other synonyms for Billie The Kid include The Kid, the Wichita Kid, and the Cyclone of the Southwest. Her reputation as a skilled gunfighter also earned her the nickname "The Regulator." Regardless of what she was called, Billie The Kid left an indelible mark on American history as one of the most infamous outlaws of all time.