Dejah Thoris was the title character of the 1917 novel, A Princess of Mars, by Edgar Rice Burroughs and it's sequels. She was the granddaughter of the Jeddak (King) of Helium. She was the wife of an Earth man, John Carter, with whom she had two children, Carthoris and Tara.
Dejah Duare was a character in the Star Wars novels Coruscant Nights, parts II and III. She was a Zeltron living on Coruscant. Her lover, Ves Volette, was murdered. After she found his murderer, she joined Whiplash, an anti-Galactic Empire resistance group.
Dejah is a variant of the French name Deja, and means "remembrance or before". It is also sometimes used as a nickname for Dejanira, a variation of Deianeira, who was the wife of Hercules. Dejah made it into the top 1,000 names in four different years, 1996 (#982), 1998 (#784), 1999 (#671), and 2000 (#927). In 2014, 33 girls were named Dejah, and 118 were named Deja.