Xaying it right!
The citizens of the erstwhile Indian state of Assam have decided to challenge the rest of us by starting a campaign whereby our tongues will be twisted beyond company specifications, but it looks like we will remain where we started and not be pronouncing anything correctly. Not for your average Assamese gentleman/gentlelady will the conversion be as simple as from a Bombay to a Mumbai, a Madras to a Chennai, or a Calcutta to a Kolkata. No, first they will tell you that Assam is no longer Assam, it is to be 'Asom'. Fair enough. And 'Assamese' will be replaced by Asommiya (it used to be Assamiya, but let that be).
Now, Messrs Borbora, Bordoloi and Bezbaruah tell us that it is not so much the spelling as the pronunciation that they are after. Spell it any way you like, as long as you pronounce it properly, is the refrain. And how do you pronounce Asom? Something like Akhhom, in which you replace the middle consonant with a deep-throated aspirated attempt to reach into the lungs and exhale bits and pieces of diaphragm tissue. As long as you can say Akhhom in the process, the Akhhomiya do not really care how you spell it.