In the Zohar ( Zohar/Bereshit B/Chapter 62 ), it says:
358. In the words, "This is the book of the generations of Adam" (Beresheet 5:1), "GENERATIONS" REFERS to images OF THE SOULS, BECAUSE ALL THE SOULS WHO ORIGINATED FROM ADAM ARE LISTED IN THE BOOK. Rabbi Yitzchak said: The Holy One, blessed be He, revealed to Adam the images OF THE SOULS of all the generations who will come into the world and of all the sages and kings of the world destined to rule over Yisrael.
Why does the Lashon say, 'ALL THE SOULS WHO ORIGINATED FROM ADAM ARE LISTED IN THE BOOK'. Doesn't everyone human being come from Adam HaRishon? The phrase is talking as if there exist souls that did not originate from Adam HaRishon.