There are claims and counterclaims regarding possible borrowing between Celtic languages. According to RM, "the Brittonic words (MW cledyf, MBret. clezeff, Co. clethe) are early loanwords from Goidelic". For MDV, the direction of borrowing is the converse: OIr. claideb <- W. cleddyf < *kladimo-., Probably <- PCelt. *gladio-, *kladio- 'sword'; but RM is cautious: "It is usually assumed that Lat. gladius was borrowed from Celtic in prehistoric times, but it could also be inherited (with *kl > gl- as in Lat. glōria < *klowesyā)" (RM). “The close connection with Celtic words for 'sword', together with the imperfect match of initial consonants, and the semantic field of weaponry, suggests that Latin borrowed a form *gladio- or *kladio- (a hypothetical variant of attested British Celtic *kladimo- 'sword') from PCelt. or from a third language.” (MDV).
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