Where does “Basilius” come from?

Basilius (Latin) comes from Ancient Greek βασίλειος, from Ancient Greek βασιλεύς, from Proto-Hellenic gʷatiléus — chief; king.

Ancestry of “Basilius”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	βασίλειος	of the king, kingly, royal
2	Ancient Greek	βασιλεύς	chief, master; king, lord, patron
3	Proto-Hellenic	gʷatiléus	chief; king

Basilius — Etymology, Origin & Word History | Etymology Explorer