Some people dispute the fact that the Olmec people were called Xi, plural Xiu. They claim that the name Tutul-xiu is the name of a person—and not an ethnonym.
The Olmecs were a Mesoamerican civilization that flourished from 1200 to 400 BC. They are considered to be the mother culture of Mesoamerica, and their influence can be seen in many other Mesoamerican cultures, including the Maya.
The Olmecs were a complex and diverse people, and it is likely that there were many different groups of people who could be considered Olmec. One of these groups may have been the Xiu people.