What about Satoshi Nakamoto

? I would say this person can surpass Jeff in term of wealth.
Let's say he has 1 million coins... or forget it, 5 million coins!!!!!!
It's still only 35 billion, just 1/3 of the wealth Bezos is credited with.
Yeah they are also known for being the richest family in the world but they are not allowing their names to be included to those lists. Don't also forget about the Rockefellers. I've read articles that says they are few of the families that has control to the worlds economy.
I would put my money on the family that controls the tinfoil production.
They are probably the wealthiest judging by the high demand for hats here.
Putting jokes aside, if you think about it, I'm pretty sure the richest people in the world aren't fighting for the spot on Forbes list. The wealth of guys like Bezos or Gates can be calculated because these people own companies, own properties, pay taxes. There are people though who own valuable art, jewelry, gold, worth millions, but since they are holding it all behind closed doors they are considered to be millionaires, while at the same time being billionaires.
I'll also add that secret societies do exist, it's a fact, not a matter of belief.