Where does “Flatdalr” come from?

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

Ancestry of “Flatdalr”, step by step

Flatdalr traces back through two separate lines of ancestry.

via Old Norse dalr

StepLanguageWordMeaning
1Old Norsedalrdale, valley
2Proto-Germanicdaląvalley, dale
3Proto-Indo-Europeandʰel-an arch, vaulting, curve, curvature, cavity;...

via Old Norse flatr

StepLanguageWordMeaning
1Old Norseflatrflat, level; flat, prostrate
2Proto-Germanicflatazflat
3Proto-Indo-EuropeanplÁt-—
Every word from Proto-Indo-European dʰel- →Every word from Proto-Germanic dalą →Every word from Old Norse dalr →