Name of Tibet

[Stefan Baums]

András Róna-Tas discusses the name ‘Tibet’ in his

   Wiener Vorlesungen zur Sprach‐ und Kulturgeschichte Tibets.
   Wien: Arbeitskreis für tibetische und buddhistische Studien,
   1985.  (Wiener Studien zur Tibetologie und Buddhismuskunde,
   Heft 13.)

If memory serves right, he mostly refers to Turkic and other
Central Asian sources, but you may be lucky and find something
about Sanskrit connections as well.

Best regards,
Stefan Baums

-- 
Stefan Baums
Asian Languages and Literature
University of Washington