"Giselle? That's not the name on the documents — " "Oh no." Bob gave her a sad smile. "Her real name was Staci, but she once studied ballet, and Jeb thought she was so graceful, with her big brown eyes. Like Bambi. So the pet name went from Gazelle to Giselle. Giselle is a famous ballet," he added, in case A. P. Hill were culturally challenged.
Source: wiktionary