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Latin word francus comes from Proto-Indo-European *prAgn-
*prAgn- (Proto-Indo-European)
*frakkōn (Proto-Germanic)
*Franko (Frankish)
francus (Latin)
(Late Latin) Frank, of or pertaining to the Franks. (Medieval Latin) French, of or pertaining to the French people.. (Medieval Latin, substantive) a Frenchman (New Latin) franc (currency).