From Halopedia, the Halo wiki
The Luxor Spaceport is a starship hub located in Luxor, Eridanus II in the Eridanus System. It appears to be fairly close to Elysium City, a population center on the planet.
On August 17, 2517, Doctor Catherine Halsey and Lieutenant Jacob Keyes used Luxor Spaceport on their way to Elysium Citys Elysium City Primary Education Facility Number 119 to observe future Spartan-II John-117.
Luxor was the name of an important Egyptian city in ancient Egypt.