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For example we use Guangzhou not Canton (the English name), but we use Cairo (the English name), not Al-Qahirah.
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I’ve also noticed, for instance we tend to use the native name in India but the English name in Arabic-speaking countries. This also sparked a quiz idea for me. Drop a comment saying what country I should do next… Translate Cities to English!
https://www.jetpunk.com/tools/city-reference
Other than that, Wikipedia.
You can also just like pick any use the other option as a type-in, doesn't matter that much