The name derived from Sanskrit meaning 'impregnable'.
Pala Dynasty rulers built their capital on the banks of the Brahmaputra and surrounded it with a rampart and a strong palisade, whence they named it Durjaya (=impregnable). Many wealthy merchants lived there in safety and it boasted of many plastered turrets. Encouraged by the King, the learned men, religious preceptors, and poets made it a place of resort.
- Prakash, Col Ved, Encyclopedia of North-East India