Xendi Sabu IX

Xendi Sabu IX was the inhabited ninth planet in the Xendi Sabu star system.

Lieutenant Commander Brad Yacobian, a crewmember aboard both the USS Enterprise-D and USS Voyager, was born on this non-Federation planet. In 2369, his planet of origin was listed on the chart "USS Enterprise Personnel Database", which was seen on Jean-Luc Picard's PADD. (TNG: "The Chase" okudagram)

This planet was only mentioned in writing.
Based on the planet's seemingly close proximity to the Maxia Zeta star system, it would seem that this planet is in, or is relatively near the Alpha Quadrant.