gallo-, Gall-

(Latin: of or pertaining to Gaul)

Gallic
Gallomania
An unreasoning attachment to France or French customs.
Gallophile
Gallophilia
Gallophobe
Gaul
A region which is now modern-day France and Northern Italy.

It apparently comes from the Germanic root meaning "foreigner, stranger" and includes English Wales, Welsh, Wallachian, and Walloon.