Where does “Πάνθοος” come from?

Πάνθοος (Ancient Greek) comes from Ancient Greek θοός, from Ancient Greek θέω, from Ancient Greek θεϝ-, from Proto-Indo-European dʰew- — to die, pass away; to run, flow.

Πάνθοος (Ancient Greek): Panthous, son of Othrys and elder of Troy

Definitions

Panthous, son of Othrys and elder of Troy

Ancestry of “Πάνθοος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	θοός	quick, swift; sharp, pointed
2	Ancient Greek	θέω	I run; I fly
3	Ancient Greek	θεϝ-	—
4	Proto-Indo-European	dʰew-	to die, pass away; to run, flow

Every word from Proto-Indo-European dʰew- →Every word from Ancient Greek θεϝ- →Every word from Ancient Greek θέω →