According to a tradition, Dinajpur derived its name from Raja Dinaj or Dinaraj who founded the Dinajpur Raj (the estate of Dinajpur).
The Dinajpur Pillar Inscription makes mention of a certain Kamboja king called the Kambojanvaya Gaudapati (i.e. lord of Gauda, born in Kamboja family).
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After originating in West Bengal, it passes through Panchagarh District, Pirganj in Rangpur District, Bochaganj in Rajshahi District and Biral in Dinajpur District in Bangladesh before it flows through Kushmandi and Bansihari community development blocks of Dakshin Dinajpur district in West Bengal.