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by kmm 2395 days ago
I'm afraid that's not true. The 's particle comes from one of the many Old English genitive case endings, namely -es (no apostrophe of course).

Interestingly, this "his genitive" emerged as a backformation of this genitive ending in the 13th century, not only in English but in a few other Germanic languages as well, before dying out a few hundred years later in some of them.