The precise origins of the song are unclear, but most ethnomusicologists believe it originated with the Gullah people (also called Geechee), the descendants of enslaved Africans who live on the Sea Islands and in the coastal regions of South Carolina and Georgia. (Perhaps you remember the kids’ TV show Gullah Gullah Island? I do! With much fondness.) The Gullah developed their own creole language, based on English but with strong influences of West African languages. The words “Kum ba yah” mean “Come by here” in Gullah. “Come by here, my Lord,” the Gullah people sang as they suffered under the Jim Crow regime. “Come by here.”
thejesusquestion.org/2014/05/16/stop-making-fun-of-kumbaya/