Multiple realities
(covers information from several alternate timelines)
Ganino was a star system in the Alpha or Beta Quadrant.
In 2367, Ganino's position was labeled on a tactical situation monitor in Captain Benjamin Maxwell's ready room on the USS Phoenix. (TNG: "The Wounded", okudagram)
In 2366, in an alternate timeline, during the Federation-Klingon War, Ganino's position was labeled on a tactical situation monitor on the bridge and in the ready room of the USS Enterprise-D. (TNG: "Yesterday's Enterprise", okudagram)
This star system was only mentioned in writing.
It can't be deduced from the star chart in which quadrant Ganino was located as there were planets and star systems from both quadrants spread throughout the chart.
The star system was named for episode co-writer Trent Christopher Ganino.