Where does “lether” come from?

lether (Old Frisian) comes from Proto-Germanic leþrą, from Proto-Celtic ɸlitro-, from Proto-Indo-European pl̥tro-.

Ancestry of “lether”, step by step

StepLanguageWordMeaning
1Proto-Germanicleþrąleather
2Proto-Celticɸlitro-—
3Proto-Indo-Europeanpl̥tro-—
Every word from Proto-Indo-European pl̥tro- →Every word from Proto-Celtic ɸlitro- →Every word from Proto-Germanic leþrą →