The word 'Bihar' is derived from the Sanskrit word 'Vihara', which means Buddhist monastery. The region was home to numerous Buddhist monasteries during ancient times, especially during the Pala dynasty when it was a major center of Buddhism. Nalanda and Vikramashila, two famous ancient Buddhist universities, were located in Bihar. Other options like Orissa (now Odisha), Sikkim, and Gujarat have different etymological origins related to their geography, tribal names, or historical kingdoms.