What is as likely as anything else is that, in conversation with UK media, Indians (so very often wanting to say what they think the listener wants to hear, as I recall) will use the name they believe foreigners are more familiar with. The same inclination drives people to, when in the company of those they believe want to hear it, flatter them with whatever they think will work, including expressing nostalgia for foreign rule and, likely, the listener will readily fall for it. Remember too that the place names of Empire were often very alien to the indigenous population, (re)applying local ones is not inventing anything.