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In page Gaul:

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The Greek and Latin names Galatia (first attested by Timaeus of Tauromenium in the 4th century BC) and Gallia are ultimately derived from a Celtic ethnic term or tribe Gal(a)-to-.[1] The Galli of Gallia Celtica were reported to refer to themselves as Celtae by Caesar. Hellenistic etymology connected the name of the Galatians (Γαλάται, Galátai) to the supposedly "milk-white" skin (γάλα, gála "milk") of the Gauls.[2] Modern researchers say it is related to Welsh gallu,[citation needed] Cornish: galloes,[3] "capacity, power",[4] thus meaning "powerful people".