Voyager (mirror)

In different permutations of the mirror universe, the regular universe's USS Voyager (NCC-74656) is one of many starships to have an alternate reality counterpart.

Dark Passions
After $𝜇$ successfully forced $𝜇$ to resign and abdicate her role as Overseer in 2369, Seven was given a ship by Intendant of Sol $𝜇$, to which Terran slave leader $𝜇$ was released.

Seven further placed Janeway's loyal followers - $𝜇$, $𝜇$, $𝜇$, Robin Lefler, Selar, $𝜇$ and Jarem - aboard the ship.

Seven made Janeway the ship's captain and the ship headed off to "right the Universe." (ST novel: Dark Passions, Book Two)

Mirror trilogy
In 2370, mirror universe agents employed by Cardassian Gul Rutal crossed into the counterpart universe at Earth Station McKinley, where they downloaded Starfleet's entire blueprints for USS Voyager (NCC-74656), and the EMH program. (TOS novel: Spectre)

Late 2374 saw the mirror $𝜇$ oversee construction of the ship at the Goldin Discontinuity. The ship was then launched in 2374 under the command of Rutal. Shortly after, the ship was hurled into the Delta Quadrant by The Caretaker to assist the race called Ocampa. In 2375 whilst still in the vicinity of the Caretaker's Array, the ship met the Talaxian Neelix, who was persuaded to come on board as a guide, only to realize he'd become a prisoner. Rutal then let the Kazon-Ogla destroy the Array. When the counterpart universe's USS Enterprise (NCC-1701-E) was located, Rutal sent Ensign Margaret Clark to spy on them, which resulted in Rutal and her minions crossing over universes to trap the Enterprise crew and steal the design of their vessel. (TOS novel: Dark Victory)