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Euler diagram of the terminology of the British Isles
(lemmy.sdf.org)
Apologies. This might not be the perfect community for the post.
Celtic would be better. Gaelic literally means coming from the Gaels, aka the Irish. Welsh and Cornish are Brythonic language speakers, not Goidelic/Gaelic, but they are all Celtic languages. The Angles, Saxons, Frisians and Jutes invaded Celtic Britain starting in the 400s.