In 1995 "bombay" was changed to "mumbai", 2 years after that "madras" changed as "chennai", recently "calcutta" as "kolkata" and latest is "bengalooru".
well, it's now become a fashion for the politician to change the name of the cities by giving a reason as regional flavour. I don't know what they are going to achieve by this? If they are particular about that, they should've done it immediately after independence or during bifurcation of the states.
India needs development, but not like this kind of cosmetic development which is useless to nobody and it's only our money is going to be wasted unneccessarily.