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French word tellement comes from French -ment, French tel (Such One (impersonal pronoun).)
-ment (French)
Used to form adverbs (from the feminine form of an adjective), most of the time equivalent to the English -wise, -ly. Used to form nouns from verbs, usually of action or state resulting of them. Equivalent to the English -ment.
tel (French)
Such One (impersonal pronoun).
tellement (French)
So (in that manner). So much (singular); so many (plural). So much so.