It is Satoshi Nakamoto. The name is spelled this way on the Bitcoin whitepaper, his old email, his Bitcointalk.org account (satoshi), vast majority of crypto news sources, along with the vast majority of the crypto community. A "Satoshi" is also known as the smallest unit of a Bitcoin (100 million satoshis to one bitcoin). You've Googled "Sotashi" to see if its been misspelled by some sources, and it has. Regardless, not the correct spelling