Still, as Berosus, who cannot easily have been ignorant of the ancient appellation of his race, applies the term Chaldaean to the primitive people, and as Scripture assigns Ur to the Chaldees as early as the time of Abraham, we are entitled to assume that this term, whenever it came historically into use, is in fact no unfit designation for the early inhabitants of the country.

Perhaps the most probable account of the origin of the word is that it designates properly the inhabitants of the ancient capital, Ur or Hur-Khaldi being in the Burbur dialect the exact equivalent of Hur, which was the proper name of the Moon-God, and Chaldaeans being thus either "Moon-worshippers," or simply "inhabitants of the town dedicated to, and called after, the Moon." Like the term "Babylonian," it would at first have designated simply the dwellers in the capital, and would subsequently have been extended to the people generally.
A different theory has of late years been usually maintained with respect to the Chaldaeans.

It has been supposed that they were a race entirely distinct from the early Babylonians--Armenians, Arabs, Kurds, or Sclaves -- who came down from the north long after the historical period, and settled as the dominant race in the lower Mesopotamian valley.
Philological arguments of the weakest and most unsatisfactory character were confidently adduced in support of these views; but they obtained acceptance chiefly on account of certain passages of Scripture, which were thought to imply that the Chaldaeans first colonized Babylonia in the seventh or eighth century before Christ.

The most important of these passages is in Isaiah.

That prophet, in his denunciation of woe upon Tyre, says, according to our translation,--"Behold the land of the Chaldaeans this people was not, till the Assyrian founded it for them that dwell in the wilderness; they set up the towers thereof, they raised up the palaces thereof; and he brought it to ruin;" or, according to Bishop Lowth, "Behold the land of the Chaldaeans.