How do you say "Louisiana"?

Back in my radio announcer days, we were given two rules for pronouncing place names. First rule, a place name is always pronounced the way the residents of the place pronounce it.

If you do not know how the locals pronounce it, you make your best effort, based on logic. If the place has what appears to be a Spanish name, try to use rules for Spanish pronunciation. San Juan would be "Sahn-wahn".

Louisiana, we were told, was named for a King Louis of France, not someone named Louise! So we should not say "Loo-wees-ee-anna". We tried to say "Loo-is-ih-anna", though occasionally we tried to imitate locals who seemed to say "loos-ih-anna"

Okay... so the French may drop the "s" and pronounce Louis as "Lou-ee".

Today, newscasters - even the big and famous ones - do say "Loo-wees-ee-anna"!

Someone please help. How are you supposed to say "Louisiana"?