Topics: Odisha - Wikipedia
Odia (formerly known as Oriya )  is the official and most widely spoken language, spoken by 33.2 million according to the 2001 Census. 
The term "Odisha" is derived from the ancient Prakrit word "Odda Visaya" (also " Udra Bibhasha" or " Odra Bibhasha" ) as in the Tirumalai inscription of Rajendra Chola I , which is dated to 1025.  Sarala Das , who translated the Mahabharata into the Odia language in the 15th century, calls the region Odra Rashtra and Odisha. The inscriptions of Kapilendra Deva of the Gajapati Kingdom (1435–67) on the walls of temples in Puri call the region Odisha or Odisha Rajya. 
The name of the state was changed from Orissa to Odisha, and the name of its language from Oriya to Odia, in 2011, by the passage of the Orissa (Alteration of Name) Bill, 2010 and the Constitution (113th Amendment) Bill, 2010 in the Parliament. After a brief debate, the lower house, Lok Sabha , passed the bill and amendment on 9 November 2010.  On 24 March 2011, Rajya Sabha , the upper house of Parliament, also passed the bill and the amendment.