Where does “Londoun” come from?

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

Ancestry of “Londoun”, step by step

StepLanguageWordMeaning
1Old EnglishLundenLondon
2LatinLondiniumLondon
3Proto-Celtic*Londinyom
4Proto-Indo-Europeanlendʰ-land, heath; loins
Every word from Proto-Indo-European lendʰ-Every word from Proto-Celtic *LondinyomEvery word from Latin Londinium