Where does “hvelfa” come from?

hvelfa (Old Norse) comes from Proto-Germanic *hwalbijaną, from Proto-Germanic *hwalbaz — curved, vaulted.

Ancestry of “hvelfa”, step by step

StepLanguageWordMeaning
1Proto-Germanic*hwalbijanąto cause to turn over
2Proto-Germanic*hwalbazcurved, vaulted
Every word from Proto-Germanic *hwalbaz →Every word from Proto-Germanic *hwalbijaną →