Here in Germany a "Dixi" is the most common word for a "portable toilet" used on festivals, outdoor events etc.
I don't know if you have Dixi's in the US, too.
But I can tell you that 95 % of every German inhabitant would think about those toilets when he hears "Dixie Landings"
I bet that's not the reason why they changed the name, but that was just my thought about "Dixie"