There had been migrations in the world continuously.
The Migration of people into Europe in waves coincides(?) with the Tsunami in Bharatvarsha, as India was then called.
Contrary to what European writers say, the migration to Europe was from India.
If one cares to check the migration dates of various countries and races in Europe, it will be noticed that it corresponds to the Great Floods that devoured lands in India.
To get an idea of the ancient tribes of India, I have looked into the Mahabharata, Ramayana and he oldest literature of the World, the Vedas.
Tusharas,(Northwest province of Pakistan)
Shakas,(Khambojas of Iran)
Paradas,( Tribes of Sailoda River in the Xinjiang province of China)
Daradas,Lohas, Rishikas( Kushanas or Kanishkas )
Uttara Kurus of trans-Himalyan regions.
Lambakas.(Tribes of Manipur)
Gandharis are Gandharas, the Bahlikas are Bactrians, Mujavat (land of Soma) refer to Hindukush–Pamirs (the Kamboja region).
The archaeological excavations in the Amu valley in Southern Uzbekistan, in Afrasiab on north-eastern edge of Samarkand and some other places in Uzbekistan, Turkmenistan,Kazakhstan and Tak-mak in Kirghizstan add further evidence of the existence of links between ancient India and Central Asia since remote antiquity.
Further, extensive excavations have been carried out with remarkable results at Kara Tepa, Fayaz Tepa, Dalverzin Tepa, Yer Kurgan, Ak-Beshin, Kranayerezka and Isyk-Ata. The discovery of manuscripts in Xinjiang (China) and many other valuable excavational finds substantively establish that India and eastern Central Asian region of Xinjiang were also in extensive political, cultural and religious intercourse with each other.
The Shakas were formerly the inhabitants of trans-Hemodos region—the Shakadvipa of the Puranas or the Scythia of the classical writings. Later evidence attests them in Drangiana i.e. Shakasthana (modern Seistan) located south of Herat. 1st century CE Periplus of the Erythraean Sea as well as 2nd century CE Ptolemy evidence also attest Indo-Scythia situated in lower Indus in western India.
The Paradas, the former inhabitants of Oxus and Sailoda (eastern Xinjiang), are noted by Ptolemy as Paradane and are attested to be living in western India in Sindhu or Gedrosia, during 2nd century CE.
The Kambojas and Pahlavas are known to have their original settlements in the east Iranian regions in Central Asia. Some allege the existence some of their settlements in post-Christian times in South-west/Southern India also.
The Rishikas are formerly attested as living in Sakadvipa as neighbors to the Parama-Kambojas of Transoxiana region. But later evidence also locates their section as neighbors to Ashmakas and Vidarbhas in south-west India. This Rishika settlement was located between Godavari and Tapti rivers, east of Nasika, north of Mulaka and west of Vidarbha.
*list of Rige Vedic Tribes Follows.