Tyrellia

Tyrellia was an inhabited planet that was located somewhere in the Alpha or Beta Quadrant, It was the homeworld of the Tyrellians. This planet was one of only three known inhabited worlds without magnetic poles, and one of only seven without any kind of atmosphere.

Starfleet officer Calvin Hutchinson was once stationed on Tyrellia. (TNG: "Starship Mine")

This planet was only mentioned in dialogue.
In "United Federation of Planets I" (Star Trek: Star Charts), there is a star system named Tyrellia in the Beta Quadrant.