Where does “Thyia” come from?

Thyia (English) comes from Ancient Greek θύω, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “Thyia”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	θύω	I offer in sacrifice, slay, burn, immolate; I...
2	Proto-Indo-European	dʰewh₂-	smoke; mist, haze

Thyia — Etymology, Origin & Word History | Etymology Explorer