Tyrelli was a star system located somewhere in the space of the galaxy's Alpha or Beta Quadrants.
History and specifics[]
The Tyrelli system's orbit was the location of at least one planet, Tyrellia.
In the year 2268, a merchant at Wagner Trading Post sold Tyrellian knives. James T. Kirk, Spock, and Leonard McCoy haggled for one. When the vendor offered a low price, Spock wondered if it had been smuggled out of the Tyrelli system. (TOS novel: Dreams of the Raven)