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.