Where does “Leukothea” come from?

Leukothea (English) comes from Ancient Greek Λευκοθέα, from Ancient Greek λευκός, from Proto-Hellenic *leukós.

Ancestry of “Leukothea”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Λευκοθέα	—
2	Ancient Greek	λευκός	bright, shining, gleaming; light in color; white;...
3	Proto-Hellenic	*leukós	—

Leukothea — Etymology, Origin & Word History | Etymology Explorer