 The name Hajo comes from a legendary king Hajo the Koch, an ancestor of the Koch dynasty, who ruled over the Rangpur district in present-day Bangladesh and some regions of Assam.In 1602, the Nawab of Dhaka and a Mughal governor moved by Lakshmi Narayan (ruler of Koch Bihar) and others attacked Parikshit Narayan, the ruler of Koch Hajo.Parikshit was defeated at Dhubri in 1614.