The possessive form (the car of Jesus) would be Jesus' car.
If we say Jesus is 11. Would it also be Jesus' 11? Jesus's 11?
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In general. people avoid forming a contraction with a word ending in S and the verb "is".
Of all the diet and fitness "experts", Richard Simmmons's probably the one I like least. It's not only strange-looking, it's a whole mouthful of mumbles when one tries to say it aloud.
It falls into the same category as contracting "am not" as "ain't". It isn't advisable.
I think the problem is using proper names in a contraction---what is the rule? For instance, "America's got Talent" is ok, because the apostrophe subs for the letters "ha" in has got Talent. But what about "Travis' got Talent?" That should be wrong because the apostrophe would be substituting for the entire word, "has". So it should be Travis's Got Talent, the apostrophe therefore subbing for "ha" like in America's GOt Talent. Unless they are both wrong....