Where does “Birgu” come from?

Birgu (Maltese) comes from Italian borgo, from Latin burgus, from Frankish burg, from Proto-Germanic burgz, from Proto-Indo-European bʰr̥ǵʰ-.

Ancestry of “Birgu”, step by step

Step	Language	Word	Meaning
1	Italian	borgo	village, hamlet; district; suburb
2	Latin	burgus	A fort or castle, especially a smaller one; a...
3	Frankish	burg	fortress; town; fortified city
4	Proto-Germanic	burgz	fortification, stronghold; city
5	Proto-Indo-European	bʰr̥ǵʰ-	—