nzumbi (Kimbudu) > zonbi (Carib. Creole) > zombie (English)
Incidentally, a "zombie" is also a voodoo snake deity of West African origin in Haiti, parts of the southern United States, and Brazil. I do not know if this is related to the Kimbudu-origin "nzumbi" (with lack of evidence, I tend to think not), but it is an interesting coincidence nontheless.
(http://kawann.k1.online.fr/atilye-de.htm)