The antichrist is anything we express in outward visible fashion that isn’t the Christ nature. As for the number of the antichrist nature (name), THINK TIME, THINK HYPOCRITE, THINK GENESIS CHAPTER ONE WHERE THE ANTICHRIST IS FIRST INTRODUCED.
Doesn’t matter when the man was born. We don’t look to Jesus the man but rather the Word and Works on earth. The voice from man, and the good things man does when following the voice (thought); these two are the witnesses to the Holy Spirit mankind walks in.