Good movie, wrong title. The movie is called zombie 2 AKA zombie flesh eaters, not zombie.
Incorrect. Zombie is the official international (re: English language) release title for the film. It was re-christened Zombie Fleasheaters by distributors in the UK (who likewise re-christened Zombi 3 as Zombie Flesheaters 2 for its video release there). Zombi 2 was the title in Italy alone in response to the previous years' Dawn of the Dead being released there as Zombi. Referencing this film as Zombi 2 outside of Italy would have made little sense since, in other countries, there would have been no Zombi to preceed it.