1978 map showing geographical distribution of the major Indo-Aryan languages. (Urdu is included under Hindi. Romani, Domari, and Lomavren are outside the scope of the map.) Dotted/striped areas indicate where multilingualism is common.
The Proto-Indo-Iranians, from which the Indo-Aryans developed, are identified with the Sintashta culture (2100–1800 BCE), and the Andronovo culture, which flourished ca. 1800–1400 BCE in the steppes around the Aral Sea, present-day Kazakhstan, Turkmenistan, and Uzbekistan. The Proto-Indo-Aryan split off around 1800–1600 BCE from the Iranians, moved south through the Bactria-Margiana Culture, south of the Andronovo culture, borrowing some of their distinctive religious beliefs and practices from the BMAC, and then migrated further south into the Levant and north-western India. The migration of the Indo-Aryans was part of the larger diffusion of Indo-European languages from the Proto-Indo-European homeland at the Pontic–Caspian steppe which started in the 4th millennium BCE. The GGC, Cemetery H, Copper Hoard, OCP, and PGW cultures are candidates for cultures associated with Indo-Aryans.
The Indo-Aryans were united by shared cultural norms and language, referred to as aryā 'noble'. Over the last four millennia, the Indo-Aryan culture has evolved particularly inside India itself, but its origins are in the conflation of values and heritage of the Indo-Aryan and indigenous people groups of India. Diffusion of this culture and language took place by patron-client systems, which allowed for the absorption and acculturation of other groups into this culture, and explains the strong influence on other cultures with which it interacted.
Genetically, most Indo-Aryan-speaking populations are descendants of a mix of Central Asian steppe pastoralists, Iranian hunter-gatherers, and, to a lesser extent, South Asian hunter-gatherers—commonly known as Ancient Ancestral South Indians (AASI). Dravidians are descendants of a mix of South Asian hunter-gatherers and Iranian hunter-gatherers, and to a lesser extent, Central Asian steppe pastoralists. South Indian Tribal Dravidians descend majorly from South Asian hunter-gatherers, and to a lesser extent Iranian hunter-gatherers. Additionally, Austroasiatic and Tibeto-Burmese speaking people contributed to the genetic make-up of South Asia.
Indigenous Aryanism propagates the idea that the Indo-Aryans were indigenous to the Indian subcontinent, and that the Indo-European languages spread from there to central Asia and Europe. Contemporary support for this idea is ideologically driven, and has no basis in objective data and mainstream scholarship.
