I was afraid someone would ask that. I looked yesterday and it wasn't on the first page of the search engine so I gave up. I guess I'm not that curious, but, now you've gone and done it. Best I could do was find:
"Tchoupitoulas, by the way, is the name of a major street along the Mississippi River and of a Louisiana Indian tribe." and " [The street "Tchoupitoulas" is derived from the famous marsh-dwelling Indian tribe of the same name.] "
All were variations along that line. Still don't know what the word actually means. I'll still be able to sleep tonight though.
BTW, ran across:
Gumbo Pages
(There were variations on this one as well).