French as a modern language has it's origins in the languages that was spoken historically across France. In the middle ages, the language of Southern France / Northern Spain / Monaco / North West Italy was Occitan, i.e. the area referred to as Occitainia. In fact Occitan is still the official language of Catalonia today.
Northern France's language is referred to as "langue d'oïl", however this is more a dialect, as Francien was the language spoken around what is modern Paris, other regions were Germanic, due to the ruling Frank's.
Over the years France has been invaded by the Moors, Romans, The Vandals (origin Poland), Visigoths (Germanic), Phoceans (Greek), Franks (Germanic) etc.
So if the French in their usual Gaulic flare are getting all uppity with Anglo-American influences, at what point in their history is the true original French language the definitive version.
Most probably the same as other countries, e.g. when we learnt to "bang the rocks together".