Alexis's is correct.
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AnonymousFor plural names, and some singular names, which end in an s, add only an apostrophe. ALEXIS'
That "rule" is far from universal, and in fact, one that I do not follow.
I would write "Alexis's" and "James's" every single time. You're welcome to pick a style and stick with it, but don't tell people there is only one rule for it when both Ja