"It is interesting to note, however, that some of these [Rigvedic] names are found in Iranian forms closer to the older, Ṛgvedic home [Afghanistan!] of the Vedic tribes […] It seems that the Iranians simply changed the old Indo-Iranian names into their respective Iranian forms when they moved into the area, while the Vedic, Indo-Aryan speakers took some of these names with them eastwards, up to Bihar, in the typical fashion of people on the move."