Gallo- /ˈɡæləʊ/
combining form
denoting Gaul or France
⇒ 
Gallo-Roman
Origin
from Latin Gallus a Gaul1
ORIGIN: from Latin  Gallus , Gallia  Gaul: see Gaul -o- 
2
ORIGIN: from gallic  adjective -o- 
Gallo-
Prefix
- Concerning Gaul or Gauls
- Concerning France or the French people (compare Gallic)
Etymology
From Latin Gallus (“Gaul”)