How Did Assam Get Its Name

Assam is a state in northeastern India, situated south of the eastern Himalayas along the Brahmaputra and Barak River valleys. The state is bordered by Bhutan and Arunachal Pradesh to the north; Nagaland and Manipur to the east; Meghalaya, Tripura, Mizoram and Bangladesh to the south; and West Bengal to the west via the Siliguri Corridor, a 22 kilometre strip of land that connects the state to the rest of India. But how did Assam get its name?