We know who is Adam Biblically. He is the husband of Eve and father of Cain and Abel.
Adam was created according to God's own image and the first man made by God. And that's all.
The mystery behind Adam and his name are not well known to mankind because most of the people don't read the Holy Scripture and don't dig the Bible. But if they will only open the Bible and will not only based their doctrines to those preaches claiming they are teachers and spiritual gurus.