Gascogne

Etymology
From and, from , from , from , from  + , from , as used by  in his 1st-century , Book III. Variously derived from (literally “he-goat people”) or a variant of  (from which, , and perhaps related to ). Cognate to. Compare.

For sound changes: /v/ → /w/ occurred in the change from Latin to Proto-Romance, while /w/ → /g/ common in (non-Iberian) Romance languages, notably French; compare and,  and. By contrast, /v/ developed into /b/ and /β̞/ in Spanish and Gascon, under influence of Basque, hence the divergence.