Satoshi Nakamoto is the name used by the unknown person or people who developed bitcoin, authored the bitcoin white paper, and created and deployed bitcoin's original reference implementation. As part of the implementation, they also devised the first block chain database.
I guess, most of the people that work with Bitcoin, know about it, but no one knows if it is the truth. I remember, several months ago the information that Elon Musk could be BTC father appeared, but the millionaire said it was not his "fault".