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- Toponymy is the scientific study of place names, their etymological origins, and their cultural significance.
- Cities acquire multiple names through colonial anglicization, post-colonial reclamation, multilingualism, and political revolutions.
- Colonial authorities often anglicized native names because indigenous phonetics were difficult for European tongues to pronounce.
- In 1995, Bombay was officially renamed Mumbai to honor Mumbadevi, the guardian deity of native Koli fishing communities.
- In 1996, Madras was renamed Chennai, derived from the historical seventeenth-century settlement of Chennapatnam.
- In 2001, Calcutta was renamed Kolkata, aligning official English spelling with the native Bengali pronunciation.
- In 2014, the Union Government approved renaming 12 Karnataka cities, including Bangalore to Bengaluru and Mysore to Mysuru.
- Varanasi bears multiple ancient names: Kashi ('City of Light' in Vedic texts) and Banaras (Pali/vernacular corruption).
- Istanbul holds a famous triple-name history: founded as Byzantium (657 BCE), renamed Constantinople (330 CE), and Istanbul (1930).
- The Turkish Postal Law of 1930 formally barred mail addressed to 'Constantinople', enforcing the name Istanbul internationally.
- In multilingual Belgium, the capital city is legally called Bruxelles in French and Brussel in Dutch.
- Switzerland's Geneva is officially Genève in French, Genf in German, and Ginevra in Italian across official state communications.
- The transformation of 'Peking' to 'Beijing' in 1979 reflected the adoption of the Pinyin phonetic romanization system by China.
- Saint Petersburg was renamed Petrograd in 1914, Leningrad in 1924 under Soviet rule, and restored to Saint Petersburg in 1991.
- Saigon was renamed Ho Chi Minh City in 1976 following the reunification of Vietnam at the end of the Vietnam War.
- Renaming cities in India requires a formal resolution by the State Cabinet and a mandatory No Objection Certificate (NOC) from MHA.
- The Ministry of Home Affairs (MHA) consults the Survey of India, Ministry of Railways, and Postal Department before granting an NOC.
- An Exonym is an external name given by foreigners (e.g., Rome), while an Endonym is the native local name (e.g., Roma).
- Some cities retain dual names colloquially: New York is formally the City of New York, affectionately called 'Gotham' or 'The Big Apple'.
- Religious traditions also generate dual names; Jerusalem is Yerushalayim in Hebrew and Al-Quds ('The Holy') in Arabic.
- Renaming railway stations, airports, and legal documentation generates significant administrative expenditure for municipal authorities.
- Multiple city names provide rich historical roadmaps documenting successive dynasties, linguistic shifts, and political transformations.
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