Where does “Gravina” come from?

Gravina (English) comes from Italian Gravina, from Medieval Latin grava, from Gaulish grawa, from Proto-Celtic grāwā, from Proto-Indo-European gʰroh₁weh₂, from Proto-Indo-European gʰreh₁w- — to grind.

Ancestry of “Gravina”, step by step

Step	Language	Word	Meaning
1	Italian	Gravina	mattock
2	Medieval Latin	grava	—
3	Gaulish	grawa	—
4	Proto-Celtic	grāwā	gravel, pebbles
5	Proto-Indo-European	gʰroh₁weh₂	—
6	Proto-Indo-European	gʰreh₁w-	to grind

Every word from Proto-Indo-European gʰreh₁w- →Every word from Proto-Indo-European gʰroh₁weh₂ →Every word from Proto-Celtic grāwā →