The given name Dejah is believed to have originated from the fictional novels of Edgar Rice Burroughs, the American author famous for creating the Barsoom series, which includes the popular John Carter of Mars stories. In these science fiction tales set on the planet Mars, Dejah Thoris is the princess of the Martian city-state of Helium and the love interest of the earthman John Carter.

Burroughs first introduced the character of Dejah Thoris in his 1912 novel A Princess of Mars, which served as the basis for the names Dejah and Thoris. While the name Thoris has roots in ancient Norse mythology, the etymology of Dejah is less clear, as it appears to be a fictional construct created by Burroughs himself.

Despite its fictional origins, the name Dejah has gained some popularity over the years, particularly among fans of Burroughs' Barsoom series. One notable person with the name Dejah is Dejah Monique Lanedress, an American model and actress born in 1991.

In the realm of literature, the character of Dejah Thoris from Burroughs' novels has become an iconic figure, inspiring numerous adaptations and tributes across various media. Lynn Collins portrayed Dejah Thoris in the 2012 film John Carter, while Traci Lords voiced the character in the 2009 animated movie Princess of Mars.

Beyond the world of fiction, the name Dejah has been used by a few individuals throughout history. Dejah Monique Raphael, an American singer and songwriter, was born in 1987. Dejah Amile Hall, an American artist and illustrator, was born in 1983.

While not a common name, Dejah has left its mark on popular culture, thanks to its association with Edgar Rice Burroughs' influential science fiction works. Its unique and exotic sound has captured the imagination of fans and artists alike, ensuring that this fictional name continues to be remembered and celebrated.