Where does “Londonstan” come from?

Londonstan (English) comes from English London, from Middle English London, from Old English Lunden, from Latin Londinium, from Proto-Celtic *Londinyom, from Proto-Indo-European lendʰ- — land, heath; loins.

Ancestry of “Londonstan”, step by step

Londonstan traces back through two separate lines of ancestry.

via English London

StepLanguageWordMeaning
1EnglishLondonSituated on the tidal River Thames in southeast England, with a metropolitan population of more than 13,000,000
2Middle EnglishLondon
3Old EnglishLundenLondon
4LatinLondiniumLondon
5Proto-Celtic*Londinyom
6Proto-Indo-Europeanlendʰ-land, heath; loins

via English Stan

StepLanguageWordMeaning
1EnglishStanAlternative letter-case form of stan; Stanley
2English-stanhome of; place where one stays; used especially...
3Classical Persianـِستَان
Every word from Proto-Indo-European lendʰ-