Where does “Vassili” come from?

Vassili (Portuguese) comes from Russian Васи́лий, from Ancient Greek βασίλειος, from Ancient Greek βασιλεύς, from Proto-Hellenic gʷatiléus — chief; king.

Ancestry of “Vassili”, step by step

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

Every word from Proto-Hellenic gʷatiléus →Every word from Ancient Greek βασιλεύς →Every word from Ancient Greek βασίλειος →