According to Daimon Bok, his ship discovered the USS Stargazer adrift at the far edge of this system in 2364. Soon after, the Ferengi made a request to Starfleet that a rendezvous with the USS Enterprise-D be arranged. The Federation starship was ordered to this system, and, while there, ownership of the Stargazer was transferred over to the Enterprise-D by the Ferengi. (TNG: "The Battle")
According to Star Trek: The Next Generation Companion (2nd ed., p. 294) and the Star Trek Encyclopedia (3rd ed., p. 568), the Xendi Kabu system from "Bloodlines" was intended to be the same system; the name was mistakenly changed in a late draft of that episode's script.
According to Star Trek: Star Charts ("United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Xendi Sabu system was located in the Alpha Quadrant. The primary was a M-class star.
According to StarTrek.com, the primary was named Xendi Sabu.
It was not stated in the episode whether Xendi Starbase 9 was in the Xendi Sabu system, or in another system close by.