Visual Dictionary implies Snoke is from the outer unknown regions
https://screenrant.com/the-last-jedi-snokes-orgins-unknown-regions/
So yeah, no real origin, he's just another bad, powerful Force user.
Now this article mentions something that's come up a lot, including a point I've made but have subsequently changed my mind about:
even outright saying Snoke’s backstory wouldn’t be revealed. This approach is very comparable to Emperor Palpatine in the original trilogy, where the words “Palpatine” and “Sith” were never even uttered on screen. Most of what fans knew about Palpatine came from the Expanded Universe, and, eventually, the prequels.
The only problem with this is that while the Emperor did not have a backstory in the original trilogy, the fact that he's called "emperor" does give him a CONTEXT. We know what emperors are, and that they rise to political power in one way or another.
It would have been a bit better if Snoke was at least given his own context, but in the end it really is just something that would end up becoming another piece of Star Wars trivia and not much else. share