köken: Etymology tree Proto-Indo-European *pénkʷe Proto-Indo-European *-tós Proto-Indo-European *penkʷtós Proto-Italic *kʷenktos Latin quīnctus Latin quīntus From earlier quīnctus, from Proto-Italic *kʷenktos, from Proto-Indo-European *penkʷtós, from *pénkʷe + *-tós. By surface analysis, quīnque (“five”) + -tus. Compare Ancient Greek πέμπτος (pémptos), Proto-Germanic *fimftô, Proto-Balto-Slavic *pénktas.
köken: From Middle Welsh Dyfynwal, from Old Welsh Dumnagual, from Proto-Brythonic *Duβnowal, from Proto-Celtic *Dubnowalos, from *dubnos (“world”) + *walos (“prince, chief”). Cognate with Breton Dunvel, via Old Irish Domnall with Irish Dónall, Scottish Gaelic Dòmhnall, and Old English Dufenal, and via Medieval Latin Dubnovaldus with English Donald and Faroese Dunaldur.