i like that the word for the cornish language in breton is essentially "big cornish"1 because "cornish"2 on its own would mean the dialect of breton.
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kerneveureg. kernev is cognate with the welsh "cernyw" and english "cornwall", but refers to a region in brittany. and kernev-veur is used to mean cornwall, and means "big cornwall" essentially.
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kerneveg is a dialect of breton, and the word cognate with the welsh "cernyweg" and english "cornish".