Where does “Varsavja” come from?

Varsavja (Maltese) comes from Italian Varsavia, from Polish Warszawa, from Old Polish Warszewa.

Ancestry of “Varsavja”, step by step

Step	Language	Word	Meaning
1	Italian	Varsavia	—
2	Polish	Warszawa	Warsaw
3	Old Polish	Warszewa	—

Varsavja — Etymology, Origin & Word History | Etymology Explorer