See this excerpt from that link:
"This article or section includes a list of references or a list of external links, but its sources remain unclear because it lacks in-text citations."

-snip-

This quote from that article sounds familiar to me "The phrase Iko Iko may have been derived from one or more of the languages of Gambia, possibly from the phrase Ago!, meaning "listen!" or "attention!".

-snip-

I had written something like that somewhere online-either on Mudcat or on my website page about Mardi Gras Indians songs {or both}, though I definitely can't remember ascribing that word "Ago!" to "the languages of Gambia" [I'm not sure which language that word comes from. I wonder if this article that gives no references based this statement on my speculations or found other references for this theory.

And, since the word "Ago" is mentioned as a possible source for the word "Iko", here's some more information about that word:

Since about the 1990s, Afro-centric Black folks in Pittsburgh, PA and elsewhere {I suppose} have been using the words "Ago!" {pronounced ah-GO! and meaning "Attention!"} and "Ame!" {pronounced ah-MAY! and meaning something like "You have our attention} as call & response commands used to bring noisy children's groups to order. These words came from somewhere. I certainly don't remember them from my days in an African cultural group in Newark, New Jersey in the late 1960s. Nor do I remember them from my involvement with Afrocentric Black cultural groups in the 1970s-1980s. But somebody said that "Ago" and "Ame" were call to attention commands from some traditional African language. And maybe they are.

Personally, I don't use these commands. If it comes across that I find them somewhat pretentious and that I'm doubtful about their authenticity...well you got that right.