Etymology
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Words related to Gaul

Galatians (n.)
Biblical epistle, from Galatia, name of an ancient inland region in Asia Minor, from Greek Galatia, based on Gaul, in reference to the Gaulish people who conquered the region and settled there 3c. B.C.E. In Latin Gallograeci, hence Middle English Gallocrecs "the Gallatians."
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Galicia 
region in Central Europe, perhaps ultimately from Lithuanian galas "end, peak," in reference to the Carpathian Mountains which rise there, or from the root of Gaul. The region in northwestern Spain of the same name is from the ancient Roman province of Gallaecia, which is perhaps from the Celtic root cala "watercourse," or else it, too, might be from the root of Gaul. Related: Galician (1749 of Spain, 1835 of Eastern Europe).
Gallomania (n.)

"excessive or undue enthusiasm for France and all things French," 1797, from combining form of Gaul + mania. Jefferson used adjective Gallomane (1787). Compare Anglomania, which might have served as the model for this word.

Gallo-Roman (adj.)
"belonging to Gaul when it was part of the Roman Empire," from combining form of Gaul + Roman. In reference to a language, and as a noun, the language spoken in France from the end of the fifth century C.E. to the middle of the ninth, a form of Vulgar Latin with local modifications and additions from Gaulish that then, in the region around Paris, developed into what linguists call Old French.
Gaulish 
1650s (adj.); 1660s (n.), from Gaul + -ish. Earlier was Gaulic (1610s).