Where does “Πολύγνωτος” come from?

Πολύγνωτος (Ancient Greek) comes from Ancient Greek πολῠ-, from Ancient Greek πολύς, from Ancient Greek πόρος, from Ancient Greek πείρω, from Proto-Hellenic *péryō.

Ancestry of “Πολύγνωτος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πολῠ-	many; much, a lot
2	Ancient Greek	πολύς	many, a lot of; neuter πολύ or πολλά as...
3	Ancient Greek	πόρος	a means of passage, passageway, way, opening;...
4	Ancient Greek	πείρω	I pierce, run through; I cleave through
5	Proto-Hellenic	*péryō	—

Every word from Proto-Hellenic *péryō →Every word from Ancient Greek πείρω →Every word from Ancient Greek πόρος →