Where does “Härjedalen” come from?

Härjedalen (English) comes from Swedish Härjedalen, from Old Norse Herjárdalr, from Old Norse dalr, from Proto-Germanic dalą, from Proto-Indo-European dʰel- — an arch, vaulting, curve, curvature, cavity;...

Ancestry of “Härjedalen”, step by step

StepLanguageWordMeaning
1SwedishHärjedalen
2Old NorseHerjárdalr
3Old Norsedalrdale, valley
4Proto-Germanicdaląvalley, dale
5Proto-Indo-Europeandʰel-an arch, vaulting, curve, curvature, cavity;...
Every word from Proto-Indo-European dʰel-Every word from Proto-Germanic daląEvery word from Old Norse dalr