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Latin duo
← Old English twā (cognate)
← English two (cognate)
← Ancient Greek δύο (cognate)
← Proto-Indo-European *dwóh₁ (inherited)
← Proto-Italic *duō (inherited)
← Sanskrit द्व (cognate)

→ English duel (derived)
→ English dual (mention)
→ English deuce (derived)
→ English doubt (mention)
→ English duo (derived)
→ English duo- (mention)
→ English duplex (mention)
→ English dozen (mention)
→ English dubious (derived)
→ English biennium (mention)
→ English duology (mention)
→ English douzeper (mention)
→ Aragonese dos (mention)
→ Asturian dos (mention)
→ Catalan duel (derived)
→ Catalan dos (mention)
→ Catalan dues (mention)
→ Corsican dui (inherited)
→ German Triell (mention)
→ Dalmatian doi (inherited)
→ Esperanto du (derived)
→ Spanish dos (mention)
→ French deux (mention)
→ French duodi (derived)
→ French duodécimal (mention)
→ Old French doi (inherited)
→ Old French ambedeus (mention)
→ Old French andui (mention)
→ Friulian doi (inherited)
→ Galician dous (mention)
→ Galician dúas (mention)
→ Ancient Greek δύο (cognate)
→ Hebrew דו (derived)
→ Hungarian duó (derived)
→ Indo-Portuguese doiz (derived)
→ Istriot dui (inherited)
→ Italian due (mention)
→ Italian duo (inherited)
→ Latin duplex (mention)
→ Latin duellum (mention)
→ Latin bis (mention)
→ Latin duodecim (mention)
→ Latin duos (mention)
→ Latin ducenti (mention)
→ Latin duae (mention)
→ Latin duodeviginti (mention)
→ Latin duodenonaginta (mention)
→ Latin duodeoctoginta (mention)
→ Latin duodeseptuaginta (mention)
→ Latin duodesexaginta (mention)
→ Latin duodequinquaginta (mention)
→ Latin duodequadraginta (mention)