Part 16 · Chapter 47

The thing is that ZA, which is Dechura Great Upper Tree, where the Neshama of Adam ha Rishon came from, called Neshama after ZA being up in the place of Bina. The Ruach of Adam is from Nukva de ZA Small Tree, Nukva, called Ruach after his Nukva having been at that time in the place of her husband ZA, as explained there in the Zohar.