Where does “fǫgnuðr” come from?

fǫgnuðr (Old Norse) comes from Old Norse fagna, from Proto-Germanic faginōną, from Proto-Indo-European pōḱ-.

Ancestry of “fǫgnuðr”, step by step

StepLanguageWordMeaning
1Old Norsefagnato rejoice
2Proto-Germanicfaginōnąto gladden, rejoice
3Proto-Indo-Europeanpōḱ-—
Every word from Proto-Indo-European pōḱ- →Every word from Proto-Germanic faginōną →Every word from Old Norse fagna →