Loo-ee Vwee-ton
Here's a breakdown:
* Loo-ee: The "ou" in "Louis" is pronounced like the "oo" in "moon".
* Vwee: The "v" is pronounced like the "v" in "very", and the "i" in "Vuitton" is pronounced like the "ee" in "see".
* ton: The "ton" is pronounced like the "ton" in "tonight".
Remember, French pronunciation can be tricky, but with practice, you'll get the hang of it.