Number of crew members The original crew complement of Voyager was 140. VOY: "Nightingale" eventually tells us that "more than a dozen" people died when the ship was pulled to the Delta Quadrant (VOY: "Caretaker"). This includes the first officer, helmsman, chief engineer, chief medical officer and nurse which were all seen or mentioned dead in the episode. The number of original crew members of the Maquis ship is not mentioned in "Caretaker" or any other early episode, although it ought to have played an decisive role when the two crews had to work together at the very beginning. "Repression" creates the impression that there are about 35 of the Maquis left on Voyager, considering that "almost a quarter of the crew" is from the Maquis, and the current crew count is 150. Taking into account the high death toll among the Maquis, they should have been 50 in the beginning, which seems way too many for the small ship. Anyway, in all later episodes the joined crew consists of about 140 individuals again, as mentioned in VOY: "The 37's", after several have been killed or have left the ship. These are too few, if we simply reckon 140-12+2+50-x. I doubt that so many (the "x") were killed in the conflict with the Kazons, which would also leave not enough crew members for the following seasons. The number of crew members even *increases* during the 3rd, 4th and 5th season, although again some people are killed. "Distant Origin" establishes a crew complement of 148, as indicated by the Voth's sensors. 150 crew members, except for Chakotay and Harry, die in the alternative timeline in "Timeless". In the 6th and 7th season the number is constant at 150.
The actual problem is that many more than 150 different faces of actors and extras could be seen. Actually, only very few of the supporting cast and the extras were seen more than only once. Not even established names of crew members (who might be shown or only mentioned) are re-used, although this would be imperative on a small and isolated ship. This is why the maximum number of 150 names was finally reached in the seventh season, according to the now defunct site "Roll Call: The Minor Crew Members of Voyager". So unless the crew frequently change their names (maybe many of them got divorced and now use their maiden names ;-)) and even their faces (I think the Doctor can do miracles ;-)), the inexhaustible crew supply is impossible.