As we saw, there is a large class of personal names and name-elements common to the Late Books and hymns of the Rigveda (386 hymns in the Late Books of the Rigveda and 8 Late hymns in the earlier Books), and to the Avesta (the bulk of the names, right from the name of the first composer of the Avesta, and the names of his closest associates), the Mitanni (including every common name element known), and the Kassites (the only known name). These names and name-elements are fundamental to all four groups, but completely absent in the Early and Middle Books of the Rigveda (apart from the 8 Late hymns mentioned earlier). And all these names and name-elements are very common in post-Rigvedic texts.