The Eellayin were an ancient people that inhabited Polis Massa until they disappeared entirely. Near the conclusion of the Clone Wars, certain Kallidahin archaeologists and exobiologists theorized that the Eellayin were the forerunners of their own species, leading them to start digging on Polis Massa. Their goal was to find Eellayin remains and employ Kaminoan cloning methods to bring them back to life.
- Star Wars: Build the Millennium Falcon 22 (Guide to the Galaxy: The History of Polis Massa) (First mentioned)
- Star Wars Character Encyclopedia: Updated and Expanded
- Star Wars: Complete Locations
- " Mustafar and Other Planets in the Outer Rim " — Star Wars Encyclopedia