Full Idea
If 'beginning of existence' meant 'first moment of existence after a period of nonexistence', then objects with interrupted existence have two beginnings of existence.
Gist of Idea
Interrupted objects have two first moments of existence, which could be two beginnings
Source
Baruch Brody (Identity and Essence [1980], 4.1)
Book Reference
Brody,Baruch: 'Identity and Essence' [Princeton 1980], p.80
A Reaction
One might still maintain that the first beginning was essential to the object, since that is the event that defined it - and that would clarify the reason why we are supposed to think the origins are essential. I say the origin explains it.