Where does “farn” come from?

farn (Old Frisian) comes from Proto-West Germanic farn, from Proto-Indo-European pornóm, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “farn”, step by step

StepLanguageWordMeaning
1Proto-West Germanicfarnfern
2Proto-Indo-Europeanpornómfeather, wing; fern, leaf
3Proto-Indo-Europeanper-before, in front; first; to go through
4Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European pornóm →