Where does “floggian” come from?

floggian (Old English) comes from Proto-Germanic flukkōną, from Proto-Indo-European pluknéh₂-.

Ancestry of “floggian”, step by step

StepLanguageWordMeaning
1Proto-Germanicflukkōnąto fly, flutter
2Proto-Indo-Europeanpluknéh₂-—
Every word from Proto-Indo-European pluknéh₂- →Every word from Proto-Germanic flukkōną →