seis (Spanish)

Where does "seis" come from?

The Spanish word 'seis' traces its roots back to the ancient Proto-Indo-European number *swéḱs. It evolved through Proto-Italic and Latin as 'sex' before naturally shifting into the Spanish 'seis'. This linguistic journey connects it to a vast family of related words, including the English 'six', the French 'six', and the Ancient Greek 'héx'.

Full etymology tree

• seis (Spanish), 'six'
  • inherited sex (Latin), 'six; 6'
    • inherited *seks (Proto-Italic), 'six'
      • inherited *swéḱs (Proto-Indo-European), 'six'
        • derived *wéḱs (Proto-Indo-European)
        • derived *séḱs (Proto-Indo-European)

Ancestors

• sex (Latin)
• *swéḱs (Proto-Indo-European)

Cognates and doublets

• ἕξ (Ancient Greek)
• six (English)
• six (French)
• six (Old English)

Descendants and derived words

• sais (Aklanon)
• sayis (Cebuano)
• seis (Tagalog)
• seis (Tagalog)

Updated July 2026

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