If I knew he was French, I would say it in the French way. Then again, "Louis" is quite common. If it was a French name that was not common, it would probably be pronounced in an Anglicized way.
Of course, I am an ice hockey fan, and am exposed to more French-Canadian names than most Americans who are not hockey fans.
Edit to note I was talking about "Louis" and not "Braille."
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