Here are some other ways to say "bye" in French, depending on the situation:
* Salut: A more casual "bye" like "see ya" or "later"
* À bientôt: "See you soon"
* À plus tard: "See you later"
* Bonne journée: "Have a good day" (used more in the afternoon)
* Bonne soirée: "Have a good evening"
* Bonne nuit: "Good night"
The best choice will depend on the context and your relationship with the person.