Sadala

Planet Sadala (サダラ,  Sadara) is the native planet of the Saiyans.

Universe 7
Planet Sadala was the Saiyan's original home planet, however, the planet is soon destroyed by internal conflict and discord caused by the Saiyans living there. The Saiyans that lived there moved to another planet and renamed it, Planet Vegeta.

Altered Timeline (Universe 7)
In Dragon Ball Xenoverse 2, Frieza Race Time Patroller Jierra mentions going on a mission to the Saiyan home world to the Future Warrior. He reveals that due to a history change, the internal conflict that destroyed the planet never occurred allowing the Saiyans to continue living there in peace. As this conflicts with the original history of Planet Sadala of Universe 7, Jierra was reluctantly forced to rekindle the conflict in order to correct history. Despite being a member of Frieza's race, Jierra reveals he feels pretty bad about it despite fulfilling his duty. Planet Sadala is only mentioned and does not actually appear in Xenoverse 2.

Universe 6
Planet Sadala still exists in Universe 6 and Cabba is a Saiyan from the existing planet. According to Cabba, it is ruled by Universe 6 Saiyan King who has a strong and prideful personality similar to Vegeta's. As part of the Super Pack 1 DLC, Planet Sadla of Universe 6 is referred to as Planet Sadal in the name for Cabba's main skillset, Battle Suit (Planet Sadal).

Trivia

 * Sadla is an anagram of the word "Salad".
 * Planet Sadla was first revealed in the Dragon Ball Super manga under the name "Planet Salada" (惑星サラダ, Wakusei Sarada), but this was later changed to "Sadla" in the anime, as well as the collected volume of the manga.
 * When reporting that Saiyans are not originally from Planet Vegeta, the authors of the Dragon Ball GT Perfect Files wonder if the original planet of the Saiyans is still around and even call it Planet Saiya.