yksi (Finnish)

Where does "yksi" come from?

The Finnish determiner 'yksi', meaning 'one' or acting as an indefinite article, descends from the Proto-Finnic form '*ükci'[1]. This earlier regional form itself traces back further to the ancestral Proto-Uralic '*ükte'[1]. Related cognates across the language family include Estonian 'üks' and Northern Sami 'okta'.

Open questions

• The intermediate and root forms '*ükci' and '*ükte' are reconstructed historical stages rather than directly attested forms. [1] [2]

Full etymology tree

• yksi (Finnish), 'one (first mentioned of two things or people)'
  • inherited *ükci (Proto-Finnic), 'one'
    • inherited *ükte (Proto-Uralic), 'one'

Ancestors

• *ükci (Proto-Finnic)
• *ükte (Proto-Uralic)

Cognates and doublets

• вейке (Erzya)
• üks (Estonian)
• okta (Northern Sami)
• одӥг (Udmurt)

Sources

1. yksi (Finnish) - Wiktionary
2. ükci (Proto-Finnic) - Wiktionary

Updated August 2026

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