Here's the conventional translation:
“plurality should not be posited without necessity,"
Wikipedia defines Ockham's razor as:
“Among competing hypotheses, the one that makes the fewest assumptions should be selected.”
Except that's not what Ockham actually said. He's been the victim of selective editing. What he really said is:
“Nothing ought to be posited without a reason given, unless it is self-evident or known by experience or proved by the authority of Sacred Scripture.”