Where does “gău” come from?

gău (Romanian) comes from Latin cavum, from Proto-Indo-European ḱówHwos — cavity.

Ancestry of “gău”, step by step

Step	Language	Word	Meaning
1	Latin	cavum	a hole, cavity, depression, pit, opening; a cave,...
2	Proto-Indo-European	ḱówHwos	cavity

gău — Etymology, Origin & Word History | Etymology Explorer