Proto-IE: *k'wa(i)n-
Meaning: lead (?), copper (?)
Hittite: {kuwanna(n)- `Kupfer(blau), Schmuckstein' - source}
Old Greek: kǘano-s m. `Lasur- od. Blaustein, blaugefärbter Glasfluss, dunkelblaues Email'
Russ. meaning: металл (свинец ? медь ?)
References: WP I 368