Sorry, I have no intention of hijacking this thread.

Short answer, there have been studies done on Africanisms in African American culture-among the Gullah people of isolated areas in the coastal South.

see: http://www.coastalguide.com/gullah/

and also among other African Americans.

After reading your post, I searched but couldn't find a book I know I have somewhere on African words in {American} English.

However, I did find this book Joseph E. Holloway, editor "Africanisms in American Culture" {Indiana University Press, 1990...

One chapter of that book focuses on "African elements in African American English". That chapter talks about "language behaviors".

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There are also personal names that have survived, particularly from the Akan {Ghana, West Africa} cultures.

Of course, no discussion of Africanism would have merit if it did not focus on call & response tradition in music and speech.

That's some random thoughts, all only tangentially related to this thread's subject.

Again, sorry for the digression.

And may I say that I find the central topic of this thread interesting.

Best wishes,

Azizi