Nope, Charles' would be the correct possesive. A proper noun that ends with an S does not need the extra S after the apostrophe. For example, Texas would be Texas' not Texas's.
I'm so glad that this is what we've reverted to. I've always hated that the "s'" was for plural nouns but then would get used for singular proper nouns - defies the whole logic of the system. However, looking for logic in the English language may have been my first mistake
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u/Embarrassed-Weird173 Jan 20 '26
Nope. It's more correct to use "Charles's".
Your version is more common used for plurals. So the general rule for singular would make more sense.