Where does “hyperboreanus” come from?

hyperboreanus (Latin) comes from Latin hyperboreus, from Ancient Greek ὑπερβόρειος.

Ancestry of “hyperboreanus”, step by step

Step	Language	Word	Meaning
1	Latin	hyperboreus	hyperborean
2	Ancient Greek	ὑπερβόρειος	—

hyperboreanus — Etymology, Origin & Word History | Etymology Explorer