How did Bombay become Mumbai?

Mumbai? What About Bombay? - How the city got renamed. By Christopher Beam Mumbai's residents, speakers of Marathi and Gujarati, the local languages, have always called the city Mumbai. "Bombay" is an anglicization of the Portuguese name "Bombaim," which is believed to derive from the phrase "Boa Baía" or "Good Bay".Portugal held territories in western India until 1961. That was Goa, Daman and Diu. see more in "I Love India"