Where does “ออสโล” come from?

ออสโล (Thai) comes from English Oslo, from Norwegian Oslo, from Old Norse Ósló, from Proto-Germanic ansuz, from Old High German helm, from Proto-West Germanic helm, from Proto-Germanic helmaz, from Proto-Germanic halmaz — to pierce, strike; to stick; prick; stab.

Ancestry of “ออสโล”, step by step

StepLanguageWordMeaning
1EnglishOsloFormerly called Christiania and Kristiania
2NorwegianOslo
3Old NorseÓsló
4Proto-Germanicansuzdeity, god; name of the A-rune
5Old High Germanhelmhelmet
6Proto-West Germanichelmhelmet
7Proto-Germanichelmazhelmet
8Proto-Germanichalmazhalm; stem; stalk; straw; hay
9Proto-Indo-Europeanḱolh₂mosstalk
10Proto-Indo-Europeanḱelh₂-to pierce, strike; to stick; prick; stab
Every word from Proto-Indo-European ḱelh₂-Every word from Proto-Indo-European ḱolh₂mosEvery word from Proto-Germanic halmaz