 The Hebrew Bible uses the term ("Kaśdim") and this is translated as "Chaldaeans" in the Greek Old Testament, although there is some dispute as to whether "Kasdim" in fact means "Chaldean" or refers to the south Mesopotamian "Kaldu".During a period of weakness in the East Semitic-speaking kingdom of Babylonia, new tribes of West Semitic-speaking migrants arrived in the region from the Levant between the 11th and 9th centuries BCE.The earliest waves consisted of Suteans and Arameans, followed a century or so later by the Kaldu, a group who became known later as the Chaldeans or the Chaldees.