Where does “penn-” come from?

penn- (Proto-Germanic) comes from Latin penna, from Proto-Italic petnā, from Proto-Indo-European péth₂r̥, from Proto-Indo-European peth₂- — to spread out; to fly.

Ancestry of “penn-”, step by step

StepLanguageWordMeaning
1Latinpennawing; feather, especially a flight-feather;...
2Proto-Italicpetnāfeather; wing
3Proto-Indo-Europeanpéth₂r̥wing; feather
4Proto-Indo-Europeanpeth₂-to spread out; to fly

Words derived from “penn-”

Every word from Proto-Indo-European peth₂- →Every word from Proto-Indo-European péth₂r̥ →Every word from Proto-Italic petnā →
penn- — Etymology, Origin & Word History | Etymology Explorer