Thread:User talk:CodeCat/cum Latin/reply (2)

Could it be from the same PIE source, have split in Old Latin, and then have recombined in Classical Latin? It seems like pushing it, but I can't find a better way to explain away the ubiquitous qu- that only the conjunction has. Is there any closely related language with good enough attestation (I'm thinking Umbrian, Faliscan, etc)?