Paris, Kassandra, and Helene (names from the Trojan War epic)
Glinda, Elpheba, and OZ (Wizard of OZ)
Odie, Nermal and Pooky (Garfield)
Lucy, Linus, Marcie (Peanuts)
Storm, Rogue and Beast (X-Men)
Morgaine, Arthur, and Guinevere (Arthurian Legend, keep in mind The Mists of Avalon not La Morte d' Artur)
I could go on and on...

Trevor