FromItaliana due(“for two”), first part fromItaliana(“in, a”),in most cases fromLatinad(“to, towards”), fromProto-Italic*ad(“toward”), fromProto-Indo-European*h₂éd(“to”),in certain cases, fromLatina(“from, away”), fromab(“from”), fromProto-Italic*ab, fromProto-Indo-European*h₂epó(“off, away”). Last part fromItaliandue(“two”), fromLatinduae, feminine plural ofduo(“two”), fromProto-Italic*duō(“two”), fromProto-Indo-European*dwóh₁(“two”).