Where does “Illinoian” come from?

Illinoian (English) comes from English ān, from Middle English ān, from Old English ān, from Proto-West Germanic ain, from Proto-Germanic ainaz, from Proto-Indo-European óynos — one; single.

Illinoian (English): Of or relating to the Illinoian stage

Definitions

  1. Of or relating to the Illinoian stage

Ancestry of “Illinoian”, step by step

Illinoian traces back through two separate lines of ancestry.

via English ān

StepLanguageWordMeaning
1Englishān—
2Middle Englishāna, an indefinite article
3Old Englishānlonely; entirely alone, solitary, single; one
4Proto-West Germanicainone
5Proto-Germanicainazone; some
6Proto-Indo-Europeanóynosone; single

via English Illinois

StepLanguageWordMeaning
1EnglishIllinoisA member of the above-mentioned tribe
2FrenchIllinoisIllinois, Illinese (member of the Illinois Confederation)
Every word from Proto-Indo-European óynos →Every word from Proto-Germanic ainaz →Every word from Proto-West Germanic ain →