"You" goes back to a dative & accusative form of "ye" (Anglo-Saxon was inflected like Latin and other Indo-European languages). We didn't get any pronouns from French, at least none that comes to mind, but we did get ?they" and "their" from Old Norse (thanks to the Viking settlements in parts of England)--but "them" seems to be of Anglo-Saxon origin.
"Thou" is also a word of Anglo-Saxon origins that ends in -u.
We'll really be in trouble if English is ever forced to return all of its loanwords from other languages.
like taco or burrito... they’re as american as apple pie now...
hehehe
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