This is proved by the wide diffusion of the surnames of the Nagar Brahmans of Kamarupa, such as Ghosha, Datta, Dania, Deva, Soma, Yalita, Pala, Kundu, Dasa, Naga and Nandi throughout modern Bengal and Sylhet.
The Nidhanpur grant was issued from Karnasuvarna and the text of the inscription must there tore have been composed by a pandit of that part of the country who was named Vasuvarna.