seis (Portuguese)
Where does "seis" come from?
The Portuguese word 'seis' traces its roots back to the Proto-Indo-European *swéḱs, meaning 'six'. This ancient term evolved through the Proto-Italic *seks and the Latin 'sex' before settling into its modern form in Old Galician-Portuguese. It is a linguistic relative of the English 'six' and numerous other words across the Indo-European family.
Full etymology tree
- seis (Portuguese), 'six'
- inherited seis (Old Galician-Portuguese)
- inherited sex (Latin), 'six; 6'
- inherited *seks (Proto-Italic), 'six'
- inherited *swéḱs (Proto-Indo-European), 'six'
- inherited *seks (Proto-Italic), 'six'
- inherited sex (Latin), 'six; 6'
- inherited seis (Old Galician-Portuguese)
Ancestors
- sex (Latin)
- *swéḱs (Proto-Indo-European)
Updated July 2026
Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris