Origin of Certain
From Middle English certain, certein, from Old French certain, from Vulgar Latin unattested form *certānus, extended form of Latin certus (“fixed, resolved, certain”), of the same origin as cretus, past participle of cernere (“to separate, perceive, decide”). Displaced native Middle English wis, iwis (“certain, sure”) (from Old English, ġewiss (“certain, sure”) and alternative Middle English spelling sertane (“some, certain”)
Middle English from Old French from Vulgar Latin certānus from Latin certus past participle of cernere to determine krei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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