duo (Latin)

Where does "duo" come from?

The Latin word "duo" traces its origin to the Proto-Indo-European root *dwóh₁, a term specifically used to describe things in pairs. This ancient word radiated across history, appearing as "dvá" in Sanskrit, "dúo" in Ancient Greek, and eventually evolving into the English "two."

Full etymology tree

• duo (Latin), 'two; 2'
  • inherited *duō (Proto-Italic), 'two'
    • inherited *dwóh₁ (Proto-Indo-European), 'two'

Ancestors

• *duō (Proto-Italic)
• *dwóh₁ (Proto-Indo-European)

Cognates and doublets

• δύο (Ancient Greek)
• two (English)
• дъва (Old Church Slavonic)
• twa (Old English)
• द्व (Sanskrit)

Updated July 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris