They may have split off from the parent tribe in southern India and come northwards separately.

The Parjas appear to represent the earliest Gond settlers in Bastar, who were subjugated by later Gond and Raj-Gond immigrants.

The Halbas and Bhatras are mixed tribes or tribal castes, descended from the unions of Gonds and Hindus.
38.

Origin of the Kolarian tribes The Munda languages have been shown by Sir G.Grierson to have originated from the same source as those spoken in the Indo-Pacific islands and the Malay Peninsula.

"The Mundas, the Mon-Khmer, the wild tribes of the Malay Peninsula and the Nicobarese all use forms of speech which can be traced back to a common source though they mutually differ widely from each other." [73] It would appear, therefore, that the Mundas, the oldest known inhabitants of India, perhaps came originally from the south-east, the islands of the Indian Archipelago and the Malay Peninsula, unless India was their original home and these countries were colonised from it.
Sir Edward Gait states: "Geologists tell us that the Indian Peninsula was formerly cut off from the north of Asia by sea, while a land connection existed on the one side with Madagascar and on the other with the Malay Archipelago; and though there is nothing to show that India was then inhabited, we know that it was so in palaeolithic times, when communication was probably still easier with the countries to the north-east and south-west than with those beyond the Himalayas." [74] In the south of India, however, no traces of Munda languages remain at present, and it seems therefore necessary to conclude that the Mundas of the Central Provinces and Chota Nagpur have been separated from the tribes of Malaysia who speak cognate languages for an indefinitely long period; or else that they did not come through southern India to these countries but by way of Assam and Bengal or by sea through Orissa.