Psychology comes through scientific Latin psychologia. Greek psychē had meanings involving life and soul, rather than simply the anatomical brain. The scientific discipline’s modern subject developed around a name made from older conceptual material.
This view explains the components. They are pieces of one construction, not consecutive borrowing stages.
Sources
- Merriam-Webster · psychology
Formation of the word.
- Merriam-Webster · psych-
Meaning and history of this component.
- Merriam-Webster · -logy
Meaning and history of this component.