Some of the planet names in the rough draft of SW are clearly indebted to real-life stars and constellations, as well as literature and mythology.
Princess Leia's home planet, the desert planet Aquilae, has a name with three syllables that begins with the letter A, like Frank Herbert's Arrakis. However, it also evokes the name of Aquilonia, the kingdom ruled by Conan the Barbarian in Robert E. Howard's stories. The form of the name itself comes from the real-world constellation Aquila, the Eagle.
Interestingly, the brightest star in Aquila (which, in astronomical terms, is catalogued as Alpha Aquilae) is Altair. Altair IV was the desert planet featured in Forbidden Planet. The numeral recurs in SW with the "forbidden planet" of Yavin IV.
In Dune, House Harkonnen's home planet, Giedi Prime, was said to orbit the star 36 Ophiuchi B. This resulted in Ophuchi (with one letter removed) becoming the name of the planet of "the chrome companies" in the rough draft.
Alderaan, at this stage the name of the capital city of the Empire, derives from the real-world star names Aldebaran (Alpha Tauri) and Alderamin (Alpha Cephei).
Additionally, in notes for the Journal of the Whills outline, Lucas considered naming Aquilae Yoshiro (after Toshiro Mifune). Alderaan also had an alternate name: Brunhuld (after Brynhild the Valkyrie, girlfriend of Sigurd the dragon-slayer in Norse mythology).
The two races on Aquilae/Yoshiro were to be the Bebers (the humans) and "the Hubble people," a species of green-skinned aliens much like Edgar Rice Burroughs' Green Martians. The name Hubble derives from astronomer Edwin Hubble.
Clearly Lucas was researching Norse mythology at this early stage, because the Journal of the Whills outline features a ship named Balmung (named after Siegfried's sword in the Nibelungenlied, a German variant of the story of the Norse hero Sigurd).
Moreover, Sigurd inherits his sword as a young man from his deceased father Sigmund, and uses it to kill the dragon Fafnir--an idea that very obviously had an impact on Lucas' finished film of 1977.