No Britannia

1) The words are attested only in the Brythonic languages, not the Goidelic languages, which cuts down on their chance of being Proto-Celtic in origin.
2) The relevant words don't show the regular correspondences we would expect between Celtic and Italic: they are indicative of Italic rather than Celtic prehistory. For example, Latin corpus comes from a Proto-Indo-European *krép-os-. If the same form had survived into Proto-Celtic, the regular outcome would be something like **kreφos-, which in turn would give something like **cryw (maybe) in Welsh, as PIE *p was lost in Celtic but not in Italic.
3) Italo-Celtic is a tad controversial, tbh. Italic seems to have just as many links with Germanic: it's more likely that any similarities between the three groups are due to proximity rather than any particular shared descent from a common ancestor after PIE.
4) Occam's razor. Why assume a hypothetical common ancestor when the Latin forms explain the Welsh outcomes exactly?

Can you point to readings on this? I'm genuinely interested, but limited in my background.
 
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