The Jats moved into India from the north when the Ice Age ended circa 1500 b.c. , Indo European speakers they were part of the “Aryan invasion” with a language perhaps then melded with also Indo European Sanskrit (the language of the ice age Indus Valley Civilization of mostly Kushites who adopted an Indo European tongue of perhaps Madai, a son of Japheth. Those Jats were the Gutis of the Ice Age who lived in the Zagros mountains harassing and once conquering Sumer, then as the Ice Age ended, they spread west too, known as the Getae, Goths, and Geats, all the way to Jutland of Denmark.
