Seems to be Olmec.
The word cacao drives from kakawa, from the Olmec language dated to 1000 BC. Sometime between 400 BC and 100 AD, the Maya borrowed this word into their own vocabulary. The exact origin of the word chocolate is unknown. It may derive from Maya verb chokola'j, meaning 'to drink chocolate together', or from the Yucatec word chocol haa, meaning 'hot drink'. It is often reported to derive from the word Nahuatl (the language of the Aztecs) word "tchocoatl." Shortly after tasting the drink at the Court of Moctezuma in Tecnochtitlan, Cortes was told that the chocolate-based drink started with "cacahuaquchtl" powder (the origin of the word "cocoa"), which was then boiled in water and combined with chilli, musk and honey and ground maize.Theobroma cacao, the name of the cacao tree, from which chocolate is derived, was named by Linnaeus in 1753.
http://groups.msn.com/FoodiesCorner/...teorigins.msnw