:::::::As far as Bangalore is concerned, I think that is a different matter altogether.  Advanced Google searches show that the city is still mainly referred to as Bangalore in Indian English.  This is probably because, as far as I'm aware, the government in New Delhi has never completed the name change to Bengaluru requested by the government of Karnataka.  Despite the state government making the request in 2006 (six years ago!), the 2001 census still referred to Bangalore.  This newspaper article from February 2011 indicates that the name was still uncertain, and that an alternative proposal to change to Bengalooru was then complicating the matter.  I am unable to find any further news after that date to confirm what subsequently happened.  I think, until the city, state and union governments can sort themselves out, it is unlikely that any new name (which would be unofficial) will take off in general useage, even within India.  You cannot really expect Wikipedia to endorse the name change when the three levels of government seem incapable of working through the process.