The spelling of the word "Landan" is not correct in Standard English. However, it can be observed that the word likely represents the phonetic pronunciation of "London", as spoken by certain dialects. Using the International Phonetic Alphabet (IPA), the pronunciation of "London" is /ˈlʌndən/. The change from "o" to "a" in "Landan" may be explained by the use of a dialect that substitutes the [ʌ] vowel with [a]. Nonetheless, using standard spelling rules, the correct spelling for the word is "London".
The word Landan is a variant of the name London, which refers to the capital city of England. The etymology of London can be traced back to its original Roman name, Londinium. The precise origin of the word Londinium is uncertain, though various theories have been proposed. One theory suggests that it may have derived from a Celtic word referring to a place with abundant rivers, given London's location on the River Thames. Another theory suggests a possible Roman origin, with a derivation from the Latin word londinensis meaning of the Londini, the name of a Celtic tribe inhabiting the region. Overall, the name Landan is essentially a phonetic or dialectal variation of London.